A ball ` A` is dropped from a building of height ` 45 m`. Simultaneously another ball ` B` is thrown up with a speed ` 40 m//s`. Calculate the relative speed of the balls as a function of time.

Options

A. 20 `ms^(-1)`
B. 40 `ms^(-1)`
C. 30 `ms^(-1)`
D. 0 `ms^(-1)`

Answer

D

Explanation

Relative acceleration is zero as .g. is downwards for the both the bodies.