Practice question
Question
A 0.2kg ball moving at 25m/s at 53∘ to a wall rebounds elastically at 37∘ with speed 20m/s. What is the impulse magnitude? (Take sin53∘\=0.8, cos53∘\=0.6, sin37∘\=0.6, cos37∘\=0.8)
Explanation
Initial: px1=0.2×25×0.6=3kg m/s, py1=0.2×25×0.8=4kg m/s. 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 5 N s as the result, so option A is correct.
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