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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