Question

# a force acts on a particle of mass 200 g. the velocity of the particle changes from 15 m/s to 25 m/s in 2.5 s. assuming the force to be constant find the magnitude

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Solution

## Steps and Understanding : 1) By Newtons Second Law of Motion, Force is rate of change of Momentum, Here, assuming Force is constant. Mass of particle, m = 200g = 0.2Kg Final Velocity, v = 25m/s Initial Velocity, u = 15m/s Time taken, t = 2.5s Then, Rate of change of momentum =m(v-u)/t F = m(v-u) /t = 0.2 (25-15)/2.5 =0.8 Magnitude of Force is 0.8 N .

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