1.

A body is projected horizontally with a speed of 20m/s from the top of a tower . Whatwill be it's speed nearly after 5 sec? Take g = 10m//s^2

Answer»

54m/s
20m/s
50m/s
70m/s

Solution :t = 5 SECOND ,` v_x`= 20m/s ,` v_y` = GT = 50m/s
`SQRT(v^2x +v^2y) =sqrt(20^2+50^2)= sqrt2900 = 54m//s`


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