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Starting from F proportional to the rate of change of momentum, the relation F = ma is obtained because
AAcceleration equals the rate of change of velocity
BMomentum equals the product of force and time
CVelocity equals the product of mass and acceleration
DMass equals the rate of change of momentum
Answer & Solution
Correct answer: A. Acceleration equals the rate of change of velocity
1. Second law gives F = m(v − u)/t with proportionality constant k = 1.
2. Acceleration a = (v − u)/t, the rate of change of velocity.
3. Substituting this into the equation yields F = m x a.
4. Rule out option B: that defines impulse, not the step producing F = ma.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 1 "Laws of Motion", p.13_
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