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Work And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork And Energy2 Marks
Question
A ball thrown vertically upwards returns to the thrower. How do the kinetic and potential energies of the ball change?
✓

Answer

Vertically upward. so the final velocity is 0. and gravitational force is + g.
Then equations is
$-\text{u}=\text{at}$
$\text{s}=\text{ut}+\frac{1}{2\text{at}^2}$
$-\text{u}^2=2\text{gs}$

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