A particle of mass m kg lies on a smooth plane inclined at an angle of 30° to the horizontal. The particle is attached to a light inextensible string which passes over a smooth pulley fixed at the top of the plane. Another particle of mass 3m kg is attached to the other end of the string and hangs freely. The system is released from rest with the string taut and the hanging part vertical. Find, in terms of m and g, (a) (b) (i) the acceleration of the system and the tension in the string, the magnitude of the reaction force exerted by the string on the pulley.

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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.