Physics Questions and Answers

A catapult is used to project a stone. Which of the following energy conversions takes place as the stone is released?

A body is projected into space with an initial velocity V₀ at an angle, θ to the horizontal. Which of the following statements is/are correct about its motion?
I. The total time of flight is (V₀ Cosθ)/g.
II. The maximum height is (V₀ Sin 2θ)/2g.
III. The range is (V₀² Cos²θ)/g.

A ball of mass 0.5kg moving at 10ms-1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

When three coplanar and non-parallel forces are in equilibrium,
I. they can be represented in magnitude and direction by the three sides of a triangle taken in order.
II. their lines of action meet at a point.
III. the magnitude of anyone equals the magnitude of the resultant of the other two.
IV. any one force is the equilibrant of the other two.

Which of the following statements above are correct?

A man will exact the greatest pressure on a bench when he