During long jump, athlete runs before taking the jump. By doing so he__________________?
Correct answer: D. increases his momentum
- A. provide him a larger inertia
- B. decreases his inertia
- C. decreases his momentum
- D. increases his momentum
Explanation
Running before take-off increases the athlete's speed while mass remains the same, so momentum p = mv increases. Option d is correct; the likely wrong choice is option a, because running increases momentum, not inertia, since inertia depends only on mass.
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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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