Speed of ball when passing tower’s base on the way down

Practice question

Question

A ball is thrown upwards at 18m/s from a 32m tower. What is its speed when it passes the tower’s base on the way down? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

30 m/s Correct 32 m/s 28 m/s 24 m/s

Explanation

v2=v02+2gh, v2=(18)2+2⋅10⋅32=324+640=964. 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 30 m/s as the result, so option A is correct.

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