An suv is traveling at a speed of 18 m/s. if the suv had a mass of 1,550kg, what force must be applied to stop it in 8seconds?

To solve this question, we have to find the acceleration of the car first. Acceleration refers to the rate of change  of velocity of an object with respect to time. 
Acceleration [A] = [V0 - V1] / T 
Where VO = Initial velocity and V1 = Final velocity T represent time.
V0 = O
V1 = 18
T = 8
A = [ 0 - 18] / 8 = - 2.25
 A = - 2.25 M/S^2.
To find force, we are going to use the formula: F = MA
 F = ?
M = 1550
A = - 2.25
F = 1550 * - 2.25 = 3487.5
Therefore, F = -3487.5 N