A ball is projected upwards from the top of a tower with velocity at an angle of with…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A ball is projected upwards from the top of a tower with velocity

50\text{ m s}^{-1}

at an angle of

30^\circ

with the horizontal. The height of the tower is

70\text{ m}

. After how many seconds from projection will the ball reach the ground? Use

g=10\text{ m s}^{-2}

. (1)

2\text{ s}

(2)

5\text{ s}

(3)

7\text{ s}

(4)

9\text{ s}