A car's initial velocity is +25 m/s, and it accelerated at a rate of +7.5 m/s over a period of 8.0 seconds what is the car's final velocity?

Use the definition of average acceleration:

a = ∆v / ∆t

Let x be the final velocity. Then

7.5 m/s² = (x - 25 m/s) / (8.0 s)

x = 25 m/s + (7.5 m/s²) (8.0 s)

x = 85 m/s

vapour or gas assuming atmospheriv pressure

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s