Question

a body is projected horizontally with speed 20m/s what will be the speed after 5second ?

Answer 1

(see, we had answer inside the question)

a body covers 20metre per second while projected.
so,after 5seconds = 20×5
=100(metre)m in 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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