# A particle of mass 50 g moves on a straight line. The variation of speed with time is shown in figure (5-E1). Find the force acting on the particle at t =2, 4 and 6 seconds.

Given mass =

Slope for region at t=2s, is

Slope for region at t=4s, is

Slope for region at t=6s, is

Slopes represent acceleration.

Thus, at time ,

Force in the direction of motion.

Thus, at time ,

Force

Thus, at time ,

Force in the opposite direction of motion.

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