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

Answer:

Total time of flight is 18 s.

Explanation:

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

T = $\frac{2U Sin A}{g}$

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 = $\frac{2 *90 sin 90^{o} }{10}$

  = $\frac{180}{10}$

  = 18

T = 18 s

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