#work-energy theorem

Straight Line Motion - Practice Set

A block of mass 1kg moves on a rough surface with initial speed 4m/s. A retarding force F\=−0.8xN acts from x\=0.2m to x

Initial K=12×1×42=8J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 8 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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Straight Line Motion - Practice Set

A 3kg block at 8m/s encounters a force F\=−1.2xN from x\=0.5m to x\=2.5m. What is the final speed?

Initial K=12×3×82=96J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 96 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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Straight Line Motion - Practice Set

A 8kg block at 14m/s encounters a force F\=−3xN from x\=1.2m to x\=6m. What is the final speed?

Initial K=12×8×142=784J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 784 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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Straight Line Motion - Practice Set

A 2.5kg block at 7m/s encounters a force F\=−0.9xN from x\=0.4m to x\=2m. What is the final speed?

Initial K=12×2.5×72=61.25J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 61.2 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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Straight Line Motion - Practice Set

A 7kg block at 12m/s encounters a force F\=−2.4xN from x\=1m to x\=5m. What is the final speed?

Initial K=12×7×122=504J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 504 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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Straight Line Motion - Practice Set

A 4kg block at 9m/s encounters a force F\=−1.5xN from x\=0.6m to x\=3m. What is the final speed?

Initial K=12×4×92=162J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 162 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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Straight Line Motion - Practice Set

A 1.5kg block at 6m/s encounters a force F\=−0.6xN from x\=0.3m to x\=1.5m. What is the final speed?

Initial K=12×1.5×62=27J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 27 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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Straight Line Motion - Practice Set

A 5kg block at 10m/s encounters a force F\=−2xN from x\=0.8m to x\=4m. What is the final speed?

Initial K=12×5×102=250J. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 250 J as the result, so option A is correct.

Ref: NCERT Class 11 Physics > Chapter 3: Motion in a Straight Line > Topic: Straight Line Motion - Practice Set0

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