A boy on the edge of a vertical cliff 20-m high throws a stone horizontally outwards with a speed of 20 m/s. It strikes the ground at what horizontal distance from the foot of the cliff? (Use g = 10 m/s2.)

Horizontal distance from the foot of the cliff is 40 m

Explanation:

Given :

Speed of stone

Vertical distance m

Gravitational acceleration

From the kinematics equation,

Where initial velocity ( )

So time take to fall down,

  sec

Now find horizontal distance travel by stone,

  m

Therefore, the horizontal distance travel by stone is 40 m

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