A rock is thrown from the edge of a cliff that is level with the surrounding ground

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A rock is thrown from the edge of a cliff that is level with the surrounding ground. Its initial speed is

25\,\text{m/s}

and the launch angle is

60^{\circ}

above the horizontal. Neglecting air resistance and using

g=9.8\,\text{m/s}^2

, what horizontal distance does the rock travel before landing at the same elevation from which it was thrown? (a)

64\,\text{m}

(b)

55\,\text{m}

(c)

32\,\text{m}

(d)

28\,\text{m}