Question

A man throws balls with the same speed vertically
upwards one after the other at an interval of
2 second. What should be the speed of the throw
so that more than two balls are in the sky at any
time? (Given g = 9.8 m/s?)
(1) More than 19.6 m/s
(2) At least 9.8 m/s
(3) Any speed less than 19.6 m/s
(4) Only with speed 19.6 m/s​

Answer 1

Answer:

a.more than 19.6m/s

Explanation:

time b/w 1st and 2nd ball is 2sec.so we can find the initial velocity u by appling the formula t=u/g.but when we throw it with same speed then