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$\Rightarrow h = \frac{400}{2 \times 9.8} = 20.41$ m

$0 = (20)^2 - 2(9.8)h$

A particle moves along a straight line with a velocity given by $v = 3t^2 - 2t + 1$ m/s, where $t$ is in seconds. Find the acceleration of the particle at $t = 2$ s. practice problems in physics abhay kumar pdf

$= 6t - 2$

Acceleration, $a = \frac{dv}{dt} = \frac{d}{dt}(3t^2 - 2t + 1)$ $\Rightarrow h = \frac{400}{2 \times 9