A pebble is thrown vertically upwards with a speed of $20m{s}^{-1}$. How high will it be after $2s$? (Take $g=10m{s}^{-2}$)

Q. A ball is thrown vertically upwards with a velocity of 20 m $s^{-1}$ from the top of a multistorey building of 25 m high. How high will the ball rise from top of the building? (Take g = 10 m $s^{-2}$).

Q. A ball is thrown vertically upwards with a velocity of $20{ms}^{-1}$ from the top of a multistory building. The height of the point from where the ball is thrown is $025.0m$ from the ground. $\left(a\right)$ How high will the ball rise? And $\left(b\right)$ how long will it be before the ball hits the ground?
Take $g=10m{s}^{-2}$.

Q. A ball is thrown vertically upwards with a velocity of $20m{s}^{-1}$ from the top of a multi storey building.The height of the point where the ball is thrown 25 m from the ground.How long will it be before the ball hits the ground ? Take $g=10m{s}^{-2}$.

Q. A body of mass $2kg$ is thrown upward with initial velocity $20m/s$. After $2s$ find its kinetic energy will be: $(g=10m/s^2)$