Question

a boy throws balls vertically upwards he throws whenever previous ball reaches the highest point if he throws each ball after 2 seconds then how high do the ball rise​

Answer 1

20 m

Explanation:

T=4 sec {as it takes half path for 2 secs.}

$4 = 2u \div g \\ u = 20m \\ \\ h = {u}^{2} \div (2g) \\ \\ 20m$