Question

A stone is projected up from the ground with velocity of 90m calculate time it takes to travel up and back to the ground.taking g=10

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Answer 1

Total time of flight is 18 s.

Step-by-step explanation:

The projected stone is a projectile, so that the time required is the total time of flight (T).

T =
`(2U Sin A)/(g)`

where: U is the velocity of the stone (90 m/s), A is the angle of projection, and g is the gravitational acceleration (10 m/
`s^(2)`).

Then,

T =
`(2 *90 sin 90^(o) )/(10)`

=
`(180)/(10)`

= 18

T = 18 s

The time taken for the stone to travel up and back to the ground is 18 seconds.