The initial velocity of the ball thrown from the top of a building is 13.29 m/s.
When an object is thrown at an angle from the horizontal direction, the object is said to be in projectile motion. The object which follows the projectile motion is called projectile.
A ball thrown horizontally from the top of a building 24 m above the ground strikes the ground at the distance of 18 m from the base of the building.
Range of a projectile is given by
R = u²sin2θ /g
where θ =0°, g =9.81 m/s²
Put the values, we get
18 = u² /9.81
u = 13.29 m/s
Thus, the initial velocity is 13.29 m/s.
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