Question

please answer the circle one with full solution

Answer 1

7) Use third equation of motion,
$v^2=2gh\qquad\boxed{1}\\(2v)^2=2g(h+\Delta h)\qquad\boxed{2}\\\boxed{2}\div\boxed{1},\\4= \dfrac{h+\Delta h}{h}\\\Rightarrow \Delta h =3h$
8) Use third equation of motion again,
$a=\dfrac{v^2-u^2}{2s}\\=\dfrac{100^2-200^2}{2\cdot(0.1)}\\=-\dfrac{300000}{2}\\=-15\times10^{4}m/s^2$