4. Does a low mass object, such as a 20 g ball moving at 50 m/s, have less kinetic energy than a high mass object, such as a 50 kg block travelling at 1 m/s? Explain your answer.5. A seesaw is initially horizontal with respect to the ground. Alice and Bob are on the left and right side of the seesaw. Alice (Bob) has a mass of 20 kg (30 kg) and sits 2 m (1 m) from the seesaw’s pivot. Is the seesaw in equilibrium?6. How does a person’s heart cause blood to flow through the body’s blood vessels?
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