A 2N force acts on a mass. If the momentum of the mass changes by 120kg m/sec then the force acts for a time of:
Correct answer: C. 60 sec
- A. 8 sec
- B. 30 sec
- C. 60 sec
- D. 120 sec
Explanation
According to Newton's second law, Force is the rate of change of momentum i.e: F=∆p/∆t Since; F= 2NChange in momentum (∆p)= 120 kg m/sHence: ∆t = ∆p/F = 120/2 = 60 seconds
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About Linear Momentum
Linear momentum is the vector product of mass and velocity, p = mv, and changes when a net external force acts. Work includes impulse as the change in momentum, conservation of momentum in isolated systems, collisions and explosions, and the distinction between elastic, inelastic and perfectly inelastic collisions.
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