The displacement of a body from an origin O at a time t seconds is x metres where:
Dividing both sides by t we get:
`x/t` is the speed,
Put speed=5 m/s,
From the quadratic formula,
=15.81025 s and 0.94875 s
Therefore, the values of t for which the body has a speed of 5 m/s are 15.81025 s and 0.94875 s.