Question

from the diagram
if time of flight is 20 sec
find intial velocity
(Take g = 10 m/s²​

Answer 1

Time of flight is t=

g

2u

=

10

2×40

=8sec

So time taken to reach at maximum height is t

1

=t/2=4sec

Maximum vertical height d=ut

1

−

2

gt

1

2

d=40×4−

2

10×4

2

=80m

So after time 4 sec displacement is 80 m and also the distance covered is 80m.

After 8 sec it will reach back to ground, so displacement is zero and total distance traveled is 2d=2×80=160m