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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

Sagot :

Paounnidn

Answer:

B 1500N

Explanation:

The acceleration of the car - at least the average one, but that will do, is [tex]a= \frac{\Delta v}{\Delta t} = \frac 53 ms^{-2} = 1.66 ms^{-2}[/tex]

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

[tex]F= ma = 2500= m \frac53 \rightarrow m=500\times 3 N = 1500N[/tex]

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