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  4. A body is at y = 8t-3t2 from origin along y-axis. The average speed during 4 s from origin is

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Q. A body is at $y = 8t-3t^2$ from origin along $y-axis$. The average speed during $4\,s$ from origin is

Motion in a Straight Line

Solution:

Putting t = 0 we get $y = 8t - 3t^2 = 0 $ and at t = 4 we get y =$8 \times 4 - 3 \times 4^2 = - 16$
Average velocity = $\frac{- 16 - 0}{4} = - 4 \, m \, s^{-1}$