4 (a) A plane is inclined at an angle of 10° to the horizontal. A ball is projected from a point A on the plane and hits the plane for the first time at a point B The line AB is a line of greatest slope of the plane. The initial velocity of the ball is Vm s-¹ at an angle above the plane, as shown in the diagram below. 10° Vms-1 0 The time taken for the ball to move from A to B is 1.5 seconds. The distance between the points A and B is 15 metres. Find the value of giving your answer to the nearest degree. B

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