Question

A ball is thrown vertically upward from the ground with speed of $25.2m/s$. The ball will reach the highest point of its journey in ______.

• A. $5\cdot 14s$
• B. $3\cdot 57s$
• C. $2\cdot 57s$
• D. $1\cdot 29s$

Answer 1

The correct option is C $2\cdot 57s$

At topmost point $v=0,a=g=-9.8m/s^2$

$v=u+at$

$0=25.2-9.8t$

$\therefore t=2.57s$