A 4.0 kg toy race car can move along an x axis. The figure below gives Fx of the

Question

A 4.0 kg toy race car can move along an x axis. The figure below gives Fx of the force acting on the car, which begins at rest at time t = 0. (The vertical axis is marked in increments of 2.5 N.)

(a) What is the momentum of the car at t = 6.0 s?

(b) What is the momentum of the car at t = 9.0 s?

(c) What is the car's velocity at t = 7.0 s?

A 4.0 kg toy race car can move along an x axis. The figure below gives Fx of the force acting on the car, which begins at rest at time t = 0. (The vertical axis is marked in increments of 2.5 N.) (a) What is the momentum of the car at t = 6.0 s? (b) What is the momentum of the car at t = 9.0 s? (c) What is the car's velocity at t = 7.0 s?

Explanation / Answer

(a) force = mass x acceleration => 10N = 5kg x a => a = 2N/kg Also v = u + at...............................(Newton… Law of Motion) v = 0m/s + 2m/s/s * 4s...........(1N/kg = 1m/s/s) v = 8m/s Since Momentum = Mass * Velocity => Momentum = 5kg x 8m/s = 40kgm/s (b) Do the same for (a) above (c) Do the same for (a) above

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