Question

1, A Body Of Mass 6kg Was Acted Upon By A Constant Force Of 18N. Calc Its Velocity In 5sec. 2. A Car Moving At 108km/hr Was Gradually Brought To Rest By Constant Force Of 2500N After 8sec. Calc The Decelleratio
Steve
F = ma, so a = F/m = 18N/6kg = 3 m/s^2

v = at = 3*5

Now you try the other. Same ideas.