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The law says any object resist any change in their state of motion unless subjected to an external force. In this case the penny stay in it's position of rest and falls in the cup. While the card, that is subjected to external force, change its state.
Yes, for temperature the unit should be in Kelvin, but that's easy (K = C + 273)
V^2 = 700J/0.5*35kg
V = square root of 40
v = 6.324 m/s
Answer:
Yes, both of them are correct.
