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Instantaneous velocity

A body has an initial velocity of 3 ms-1 and has an acceleration of 1 ms-1 normal to the direction of the initial velocity. Then its velocity 4 s after the start is


 Let yx=3ms1,ax=0 yx=yx+aytt=0+1×4=4ms1 Angle made by the resultant velocity w.r.t. direction of initial velocity, i.e., x-axis, is β=tan1Vyvx=tan143

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