Question

A ball is dropped downwards. After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds

• A. 25 m
• B. 20 m
• C. 50 m
• D. 9.8 m

Answer 1

Answer: (A)

25 m

Answer 2

Distance between the balls = Distance travelled by first ball in 3 seconds –Distance travelled by second ball in 2 seconds =$\frac{1}{2}g\mspace{6mu}(3)^{2} - \frac{1}{2}g\mspace{6mu}(2)^{2} = 45 - 20 = 25\mspace{6mu} m$