Question

A man threw a stone vertically upwards from a point and it strikes the ground with a velocity of 8m/s. Find the highest point reached above the ground (m). Take g=9.8m/s²​

Answer 1

Initial Velocity u=40

Fianl velocity v=0

Height, s=?

By third equation of motion

v  

2

−u  

2

=2gs

0−40  

2

=−2×10×s

s=  

20

160

​

 

⇒s=80m/s

Toatl distance travelled by stone = upward distance + downwars distance =2×s=160m