Figure shows the position-time graph of a particle of mass 4 kg. What is the (a) force on the particle for t < 0, t > 4 s, 0 < t < 4 s? (b) impulse at t = 0 and t = 4 s ? (Consider one-dimensional motion only).

Explanation

(a) In all the three intervals, acceleration and, therefore, force are zero.
(b) `3kg ms^(-1) " at " t =0 , ( c) - 3 kg ms^(-1) " at " t = 4s`