Question

A pebbal of mass 0.05 is thrown vertical upwards. Given the direction and magnitude of the net force on the pebbal :
a) During its upward motion b) During its downward motion

Answer 1

Dear Student,

0.5 N, in vertically downward direction, in both 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 Newton’s second law of motion as:

F = m × a

Where,

F = Net force

m = Mass of the pebble = 0.05 kg

a = g = 10 m/s²

∴ F = 0.05 × 10 = 0.5 N

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

Regards