阿摩線上測驗
15. A rock falls from a cliff. The table shows the speed and acceleration of the rock at different times.
The weight of the rock is 250 N. What is the mass of the rock?
(A)2.5 kg
(C)25 kg (
(B)240 kg
(D)2,500 kg
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統計： A(5), B(13), C(16), D(4), E(0) #1342056
統計： A(5), B(13), C(16), D(4), E(0) #1342056
