Question

A ball is projected vertically upwards from the top of a tower 60m high with a velocity of 30m/s. What is the maximum height above the ground level? How long does it take to reach the ground?

Answer 1

Answer:

time of flight is approximately 7.7secs and height from ground is about 106 m

Explanation:

Here....

the time reach the highest point is

$\frac{30}{9.8} = 3.06$

and the total height is......

$60 + \frac{ {30}^{2} }{2 \times 9.8} =106$

time to hit the ground from the highest point.....

$\sqrt{ \frac{2 \times 106}{9.8} } = 4.65$

so, the total time is (4.65+3.06)= about 7.7 secs.