A pebble is dropped from rest from the top of a high well

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

A pebble is dropped from rest from the top of a

45\,\text{m}

high well. Take

g = 10\,\text{m/s}^2

. What is the speed of the pebble just before it reaches the water surface? (a)

20\,\text{m/s}

(b)

30\,\text{m/s}

(c)

25\,\text{m/s}

(d)

45\,\text{m/s}