問題詳情

3. A block of mass 5 kg moving on a frictionless surface with a speed of 3 m/scollides with another block of mass 7 kg at rest. After the collision the twoblocks stick together. What is the speed of the combined object?
(A) 1.25m/s,
(B) 1.5 m/s,
(C)1 m/s,
(D) 0.5 m/s,
(E) 2.0 m/s.

參考答案

答案：A
難度：計算中-1
書單：沒有書單，新增

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P=mv動量守恆3×5=(5+7)×vv=15/12=1.25