# A stone dropped from the window of a stationary railway carriage takes 2 seconds to reach the ground.

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A stone dropped from the window of a stationary railway carriage takes 2 seconds to reach the ground. In what time the stone will reach the ground when the carriage is moving with

(a) constant of 80 kmh-1 .

(b) constant acceleration of 2 m-1?

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The taken by the freely falling stone to reach the ground is given by

$t=\frac{2h}{g}$

In both cases, the stone will fall through the same height as it is falling when the railway carriage is stationary. Hence, the stone will reach the ground after 2 seconds.