Question

Not so fast! If a force of 2500 N is used over

the course of 3 seconds to bring a car from
rest to a speed of 5 m/s, calculate the
mass of the car!
A.4166 kg
B.1500 kg
C.12,500 kg
D.7500 kg
E.37,500 kg

Answer 1

B 1500N

Step-by-step explanation:

The acceleration of the car - at least the average one, but that will do, is
`a= (\Delta v)/(\Delta t) = \frac 53 ms^(-2) = 1.66 ms^(-2)`

We know the acceleration, we know the force, let's drop them in Newton second law.

`F= ma = 2500= m \frac53 \rightarrow m=500* 3 N = 1500N`