A truck of mass 50 tonnes is moving at 85kmph. It collides with a second truck of mass 30 tonnes moving in the opposite direction at 60 kmph. After the collision the second truck has changed its speed to 2100 cm/s in the opposite direction as before the collision. Find: (i) the velocity of the first truck after the collision (ii) the coefficient of restitution.

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.