Question

An object is thrown vertically upwards to a height of $10$ m. Calculate its
(a) velocity with which it was thrown upward.
(b) time taken by the object to reach the highest point.

Answer 1

Distance travelled, s = 10 m

Final velocity, v = 0 m/s

g = -9.8 m/s${}^2$

1) Using,

$v^2-u^2=2gs$

$u^2=196$

$u=14m/s$, where u is the velocity with which the object is thrown upwards.

2) Using,

$v=u+gt$

$t=\frac{v-u}{g}=1.43$ $sec$