Correct Answer - Option 2 : 0·3 N s
Concept:
Impulse and Momentum
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Momentum: The product of the mass and velocity of an object in motion is called momentum.
- It is a vector quantity.
- The unit of momentum is kg m s -1.
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Impulse: The change of momentum is called impulse.
- It has the same unit as momentum.
- The rate of change of momentum is called Force by the second law of motion.
\(F = \frac{Δ P}{t}\)
Δ P is a change in momentum or impulse, t is time.
- Impulse can also be defined as the product of force and time.
Δ P = F × t
- The Force is also defined as the product of mass and acceleration.
Calculation:
Mass of ball m = 150 g = 0.15 kg
time t = 0.1 s
Acceleration a = 20 m /s 2
Force = ma = 0.15 kg × 20 m /s 2 = 3 N
Impulse = Force × time = 3 N × 0.1s = 0.3 N s
So, the correct option is 0·3 N s.