The graph shows how the force on a body varies with time. Assuming that the body is moving in a straight line, by how much does its momentum change?
Correct answer: C. 20kg ms-1
- A. 40 kg ms-1
- B. 36kg ms-1
- C. 20kg ms-1
- D. 16kg ms-1
Explanation
Explanation is given below: The area under F - t" graph represents changes in momentum, since ∆ P/ ∆ t = Fchange in P= area of triangle + area of trapeziumchange in P = (2 x 2) + 0.5 x (6+2) x (4)= 20 kg ms-1
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