A man throws ball into the air one after the other. Throwing one when other is at the highest point. How high the balls rise if he throws twice a second.

Options

A. (a) ` 2. 45 m`
B. (b) ` 1. 22 5 m`
C. (c ) ` 19 .6 m`
D. (d) ` 4. 9 m`

Answer

B

Explanation

The time taken by each ball to go from starting point to highest point , `t = 1//2 sec`, which is equal to tiem taken by each ball to fall back to starting point (= 1 //2 sec)
` :. S= 1/2 xx 9.8 xx 1/2 xx (1/2)^@ = (9.8)/8 m 1.225 m`.