Physics
Grade-8
Easy
Question
A 3,000 kg truck moving at +10 
hits a 1,000 kg parked car which moves off at +15 . What is the velocity of the truck?
- 5
- 50
- 2
- 0.2
Hint:
The formula for the law of conservation of momentum is: m 1 u 1 + m 2 u 2 = m 1 v 1 + m 2 v 2.
The correct answer is: 5
- The formula for the law of conservation of momentum is: m 1 u 1 + m 2 u 2 = m 1 v 1 + m 2 v 2.
- parked car means u2=0
- let velocity of truck is v1
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