Fig. shows the position-time graph of a particle of mass 4 kg. What is the Force on the particle for t lt 0, t gt 4s, 0 lt t lt 4s? (b) Impulse at t= 0 and t= 4s ? (Consider one dimensional motion only)

Fig. shows the position-time graph of a particle of mass 4 kg. What is

1.	Fig. shows the position-time graph of a particle of mass 4 kg. What is the Force on the particle for t lt 0, t gt 4s, 0 lt t lt 4s? (b) Impulse at t= 0 and t= 4s ? (Consider one dimensional motion only)
Answer» Solution :For `t lt 0.` No force as Particles is at rest. For `t gt 4s`, No force again particle comes at rest. For `0 lt t lt 4s,` as SLOPE of OA is constant so velocity constant i.e., a =0, so force must be ZERO. (B) IMPULSE at t= 0 Impulse =change in momentum `I=m(v-u)=4 (0-0.75)=3"kg ms"^(-1)` Impulse at t=4s `I=m(v-u) =4(0.075)=-3kg ms^(-1)`