Question

A body is projected horizontally with a speed of 20m/s from the top of a very high tower .What will be its speed after nearly 5 secs.

Answer 1

100m/s
As 20*5 will give 100 as your speed after 5 seconds

Answer 2

Initial speed u=20m/s

As it is horizontally projected all the speed is as x-component.

Since there is no force in x-direction, the speed shall remain constant.

After 5sec, speed in y-axis will be,

v=0+(10)5

v=50m/s

So velocity of body will be 20i-50j

Speed will be 10√29m/s

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