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A women throws a cricket ball vertically upwards into the air. The ball leaves the womans hand 1.8m above the ground, with a speed of 9.7 m s-1. It rises and then falls back to the ground. By considering the energies involved, calculate the balls speed at the point at which it hits the ground.
You may assume that the acceleration due to gravity is 9.8m s-2 and you may neglect air resistance.
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A hammer head with mass 0.5 kg strikes the head of a nail at a speed of 10m/s .The nail is driven 1 cm into a piece of wood. What is the average force on the nail?
1,The distance, s moved by a vehicle in time, t with an initial velocity, v and a constant accelaration, a is given by s = v t + 1/2 at squared. Find the time taken to cover 84 metres with a constant acceleration 2metres a second squared if the initial velocity is 5 metres a second. Solve by factorisation. 2, The diagonal of a rectangle is 15 metres and one side is 2 metres longer that the other. Find the dimensions of the rectangle by using the quadratic formula.