### 5 Parabolic motion Work and kinetic energy Linear momentum Linear and angular motion Problems and Solutions

1. A ball is thrown from the top of a building with an initial speed of 8 m/s at an angle of 20^{o} below the horizontal. The ball hits the ground 3 seconds later.

a) How far from the bottom of building the ball touches the ground

b) How high is the ball thrown from the place

c) How long the ball reaches a height of 10 m from the place of throwing