A ball is dropped from tower of height 45 m. At the same moment another ball is thrown up with a speed of 40 ms from base. What is the relative speed of the balls as a function of time?

Options

A. The relative speed with respect to time is zero
B. The relative speed goes on increasing with time
C. The relative speed goes on decreasing with time
D. The relative speed is constant and is 40 m/sec.

Answer

d

Explanation

Both are freely fallings. Hence there is no acceleration of one wr.t. to the other. Therefore the relative speed remains constant at4cm `s^(-1)`