Question

One second after being thrown straight down, objects is falling with a speed of 20 m/S. How fast will it be falling 2 seconds later? (g=10 m/s)
A. 20 m/S
D. 80 m/s
B. 40 m/s
E. 90 m/s
C. 60 m/s
(explanation needed)​

Answer 1

A body with initial velocity u is moving in a direction with uniform acceleration a covers a distance s in some time t . Then the equation which determines the final velocity v of the body in time t is given by

v

=

u

+

a

t

v=u+at

In case of a motion under gravity, the only acceleration that acts on the body is acceleration due to gravity