MCQ practice · SSC Physics Board questions · Chapter 3: Force
In which direction will the combined bodies move?
Think it through first, then pick an option.
- a towards body P
- b towards body Q
- c in opposite directions to each other
- d they will come to rest
Answer and explanation
Correct answer: a towards body P
P has momentum 6 × 8 = 48 and Q has 3 × 10 = 30; P has the larger momentum, so the combined body moves in P's direction.
Why the other options are wrong
- b towards body Q: Q has the smaller momentum (30); the combined body goes the way of the larger momentum.
- c in opposite directions to each other: The bodies have joined into one, so they cannot move in two directions; they move one way.
- d they will come to rest: The total momentum is 48 − 30 = 18, not zero, so the combined body does not stop.
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