Ball X is dropped from rest from the top of a tall tower

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

Problem

Ball X is dropped from rest from the top of a tall tower. Two seconds later, ball Y is dropped from the same point. Taking downward as positive and

g = 9.8\,\text{m/s}^2

, after how much time from the instant ball Y is released will the vertical separation between the two balls become

29.4\,\text{m}

? (a)

1.41\,\text{s}

(b)

1\,\text{s}

(c)

0.5\,\text{s}

(d)

2\,\text{s}