Practice question
Question
A man walking at 4m/s throws a ball forward at 12m/s relative to himself. If the ball lands 10m ahead of the throw point, how long was it in the air? (Take g\=10m/s2)
Explanation
Ball’s speed relative to ground = 12+4=16m/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 16 m/s as the result, so option A is correct.
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