Question

A body falls freely from rest. (Use g=10m/s 2 ) Find its speed after falling 20m

Answer 1

Answer:

Given : g=10 m/s

2

t=10 s

Initial velocity of body, u=0 m/s

Distance covered, S=ut+

2

1

gt

2

∴ S=0+

2

1

×10×10

2

=500 m

Average velocity, v

avg

=

t

S

=

10

500

=50 m/s