Question

A stone is released from a balloon that is descending at a constant speed of 10 m/s. Neglecting

air resistance, after 20 s the speed of the stone is:

A. 2160 m/s

B. 1760 m/s

C. 206 m/s

D. 196 m/s

E. 186 m/s​

Answer 1

Answer:

Option C

Explanation:

u = -10 m/s( initial velocity is in -ve direction )

t = 20 s

a = g = -9.8 m/s^2 ( acceleration due to gravity is in -ve direction )

v = ?

We know ,

v = u + at

v = -10 - 9.8×20 = -10 - 196= -206 m/s