A builder

uilder is demolishing the chimney of a house and slides the old bricks own to the ground on a straight chute 10m long inclined at 42 to the horizontal. Each brick has mass 3 kg. () Draw a diagram showing the forces acting on a brick as it slides down the chute, assuming the chute to have a flat cross section and a smooth surface. (ii) Find the acceleration of the brick. (iii) Find the time the brick takes to reach the ground. In fact the chute is not smooth and the brick takes 3s to reach the ground. (iv) Find the frictional force acting on the brick, assuming it to be constant