Q150 / 160 · TS EAMCET 2015 · Physics

A ball (initially at rest) is released from the top of a tower. The ratio of work done by the force of gravity, in the first, second and third seconds is

  • Correct answer
    A
    $1: 3: 5$
  • B
    $1: 4: 16$
  • C
    $1: 9: 25$
  • D
    $1: 2: 3$

Solution

Work done by the force of gravity is directly proportional to the distance travel in $n$th second. $$ W \propto S_n $$ $\therefore$ Ratio of work done by the force is $1: 3: 5$.

Hence, the correct answer is option: 'A'.

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