Question

A ball is thrown vertically upwards. It returns 6 s later. Calculate : the initial velocity of the ball (Take g = 10 m s^-2)

Answer 1

From the equation of motion,

v² = u² - 2gs

Substituting the values in the formula, we get,

0² = u² − (2 × 10 × 45)

u² = (2 × 10 × 45)

u² = 900

u = 30m s⁻¹

Hence, the initial velocity of the ball = 30 m s^-1.