Question

A ball of mass 50 g is thrown vertically upwards with an initial velocity of 20 m s⁻¹. Calculate the energy dissipated if it has potential energy of 6 J at the maximum height.(g =10 m s⁻²)

The bob of a simple pendulum is imparted a velocity of 5 m s⁻¹ when it is at its mean position. To what maximum height will it rise on reaching at its extreme position if 40% of its energy is lost in overcoming the friction of air? (g =10 m s⁻²)

A spring is kept compressed by a toy cart of mass 200 g. On releasing the cart, it moves with a speed of 0.2 m s⁻¹. Calculate the potential energy (elastic) of the spring.