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Question

A runner moving at 5m/s throws a ball horizontally at 15m/s relative to himself. If it lands 18m ahead of the throw point, what is the time of flight? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Ball’s speed relative to ground = 5+15=20m/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 1 s as the result, so option A is correct.