Two stones and are released from rest from the same point at the top of a tall building

PHYSICS · Multi-part · CBSE · Physics · Gravitation · Gravitation

Problem

Two stones

S_1

and

S_2

are released from rest from the same point at the top of a tall building. Stone

S_2

is released

0.40\,\text{s}

after stone

S_1

. Neglect air resistance. (a) Derive an expression for the distance between the two stones at a general time

t

(measured from the instant

S_1

is released). (b) Using your result, calculate the separation between the stones when

t=1.20\,\text{s}

. Take

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

. (c) Find the minimum time after the release of

S_1

at which the separation becomes

25\,\text{m}

. Round your answer to two significant figures.