You can find more problems and solutions like these in the book "Practice Problems in Physics" by Abhay Kumar.
$= 6t - 2$
Would you like me to provide more or help with something else? practice problems in physics abhay kumar pdf
$\Rightarrow h = \frac{400}{2 \times 9.8} = 20.41$ m You can find more problems and solutions like
Acceleration, $a = \frac{dv}{dt} = \frac{d}{dt}(3t^2 - 2t + 1)$ practice problems in physics abhay kumar pdf