A 0.623 kg. basketball is dropped from the rooftop of a building. If it took the ball 3.5 seconds to reach the ground,  the speed of the ball before it touches the ground is 34.3 m/s                                                                                  the height of the building is 60.025 m c. What is the ball's acceleration half-way down the building? d. What is the ball's velocity half-way down the building?

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.