Question

A boy standing at the top of a tower 20 m high throw a ball
with speed 10,5 m/s vertically upwards. The ball will hit
the ground with the speed of (g = 10 m/s2)
30 m/s
2015 m/s
40 m/s​

Answer 1

Answer:

When there is a free fall, we can directly use the equation of motion :

v

2

=u

2

+2gh

here u=0

so, v=

2gh

=

2×10×20

=20 m/s