Question

How much force is needed to accelerate a 2500 kg car at a rate of 4m/s²?

10,000 N
8,400 N
625 N
7,500 N

Answer 1

F=ma

F=2500 x 4

F = 10,000 N

Answer 2

Momentum (p) is equal to the product of an object's mass (m) and its change in velocity (v).

Change in velocity (v) results in change in momentum (p), which is equal to impulse. Impulse (J) is also equal to an applied force (F) over a period of time (t).

Combining p=mv and J=F t together:

m (v final - v initial) = F t

(2,500 kg) (70 m/s - 30 m/s) = F (10 s)

Step-by-step explanation:

Solving for F we get:

10,000 N of force