Find the force? Mass: 0.5kg Initial velocity: 6m/s Final velocity: 4m/s Time: 0.2seconds

Find the force?
Mass: 0.5kg
Initial velocity: 6m/s
Final velocity: 4m/s
Time: 0.2seconds

Momentum is mass* velocity

Initial momentum = 0.5*6 = 3 kgm/s
Final momentum = 0.5*4 = 2 kg m/s

Change in momentum of the mass (object) is 2 - 3 = -1 kgm/s
minus indicates that momentum has decreased in its value.

Force is rate of change in momentum = -1 kgm/s / 0.2 s = 5 N
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Acceleration = (4 - 6)/0.2 = - 2 m/s^2

Force = 0.5*(- 2) = -1 N