Question

A ball of mass 20 g is thrown vertically upwards. What is its momentum at the highest point? (Given: acceleration of the ball = 10 ms-2in the downward direction)

Answer 1

Answer:

0.5N, in vertically downward direction, in all cases

Acceleration due to gravity, irrespective of the direction of motion of an object, always acts downward. The gravitational force is the only force that acts on the pebble in all three cases. Its magnitude is given by Newtons second law of motion as:

F=ma

Where,

F=Net force

m= Mass of the pebble=0.05kg

a=g=10m/s

2

F=0.05 × 10=0.5N

The net force on the pebble in all three cases is 0.5N and this force acts in the downward direction.