D2 A 200 g rubber ball is tied to a 1.0 m long string and released from rest at an angle 0. At thee lowest point, it has an elastic collision with a 1.0 kg block. The block is resting on a frictionless surface and is connected to a 20 cm long spring of spring constant 2.0 kN m". After collision, the spring compresses a maximum distance of 2.0 cm. 1.0 m 1.0 kg spring 200 g 20 cm (a) Determine the strain energy stored in the spring. (b) Determine the speed of the block immediately after collision with the ball. (c) Determine the speed of the ball just before and after collision with the block (d) Hence, determine the angle 0.

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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.