The displacement of an object varies with time according to the equation, ty = ((3)/(8) t ^(2) 0 3t + 5) m.Find the instataneous velocity at t = 4s.

The displacement of an object varies with time according to the equati

1.	The displacement of an object varies with time according to the equation, ty = ((3)/(8) t ^(2) 0 3t + 5) m.Find the instataneous velocity at t = 4s.
Answer» `45 MS ^(-1)` `12 ms ^(-1)` `3 ms ^(-1)` `0 ms ^(-1)` SOLUTION :`y = ((3)/(8) t ^(2) - 3t +5) m` `therefore v = (dy)/(dt) = (3 xx 2 )/(8) t -3 = 3/4 t -3` Put `t =4S, v = 3/4 (4) - 3 =0 ms ^(-1)`