Correct Answer - Option 2 : decreases by 99 kgms
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The correct answer is option 2) i.e. decreases by 99 kgms-1
CONCEPT:
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Momentum: Momentum is the impact due to a moving object of mass m and velocity v.
The momentum (p) of an object is expressed as:
⇒ p = mv
CALCULATION:
Initial speed of the body, u = 10 m/s
Final speed of the body, v = 10 cm/s = 0.1 m/s
Initial momentum, p1 = mu = 10 × 10 = 100 kgms-1
Final momentum, p2 = mv = 10 × 0.1 = 1 kgms-1
Change in momentum = p2 - p1 = 1 - 100 = -99 kgms-1
Therefore, the momentum decreases by 99 kgms-1