Question

2. A car with mass 2,500 kg is travelling at 15 m/s. What is the car's kinetic energy?

a. 37,500 J
b. 563,000 J
c. 280,000 J
d. 350,000 J

Answer 1

c, 280,000J

Step-by-step explanation:

You should use the equation KE (Kinetic Energy) =
`(1)/(2) mv^2`

m = 2500

v = 15

KE =
`(1)/(2) * 2500 * (15)^2\\`

KE = 281250 Joules.

This is consistent with the answer B, as all of the parameters given to you are rounded to 2 significant figures so naturally, the answer should also be rounded to 2 sig figs.

KE = 280,000 J