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Practice question

MCQ

Question

An elevator ascends at 3m/s for 5s, then accelerates at 2m/s2 for 3s. A ball is dropped at the end of this period. What is the time taken for the ball to hit the ground if the initial height was 20m? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

For free fall, s=½gt² and v²=2gh per NCERT. With g=10 m/s², given height or velocity yields time or distance via these equations. Substituting values gives result matching 15 m. This confirms option A as correct by uniformly accelerated motion equations.

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