What is the velocity of a rubber ball dropped from a rooftop after 3 seconds?

A. 0.31 m/s
B. 3.27 m/s
C. 6.8 m/s
D. 29.4 m/s

Assume that the acceleration downwards = gravitational field strength = 9.8 (2 s.f)

Assume that the mass of the ball is negligible and there is no air resistance.

Use the equation  =+1/22

s

=

u

t

+

1

/

2

a

t

2

s=height of building

t= time taken for the ball to drop

u=initial velocity ; this = 0, because when the ball is dropped it has no speed initially, however if the question had said projected instead of dropped then it must have an initial speed. In this scenario we assume it has 0 initial speed since the question says dropped.

Substitute values to equation :

s=(0*3)+(1/2*9.8*3^2)

s=(1/2*9.8*3^2)

s=44.1m

Explanation:

yup its correct its: c) b b