1.

A body is projected horizontally from a height of `78.4 m` with a velocity `10 ms^(-1)`.Its velocity after `3 seconds` is `(g=10 m//s^(2))` (Take direction of projection as `i` and vertically upward direction as `j`)A. `10hati-30hatj`B. `10hati+30hatj`C. `20hati-30hatj`D. `10hati-10sqrt3hatj`

Answer» Correct Answer - A
`V_(x)=U , V_(y)=-"gt"`


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