Question

a stone is projected vertically up from the top of a tower at a velocity 9.8 ms^-1. It reaches the foot of the building in 4 second. what is the height of the tower and the velocity of the stone when it reaches to the ground

Answer 1

Explanation:

u=9.8m/a

t=4s

a=9.8m/s²

distance travel by stone =height of tower

h=ut+1/2at²

h=9.8+1/2×9.8×(4)²

h=9.8+1/2×9.8×16

h=9.8+78.4

h=88.2m

now,

final velocity

v=u+at

v=9.8+9.8×4=40m/s

Answer 2

Answer:

velocity = 29.4

Explanation: