Question

6. Rank the following in terms of increasing kinetic energy:
A. A 1200 kg car going 15 m/s
B. A 10,000 kg train car at rest
C. A 15 kg meteor going at a speed of 1000 m/s
D. A 100 kg person running at 5 m/s

Answer 1

I'm doing dis greatest to least

1.C
2.A
3.D
4.B

Answer 2

Answer:

B < D < A < C

Explanation:

Kinetic energy depends on the mass and the square of the velocity of the body. A body in motion has kinetic energy.

A. m = 12000 kg

v = 15 m/s

K.E. = 0.5 mv²

      = 0.5 (12000 kg) (15 m/s)²

      = 1,350,000 J

B. m = 10,000 kg

v = 0

K.E. = 0 J

C. m = 15 kg

v = 1000 m/s

K.E.=0.5 mv²

      = 0.5 (15 kg) (1000 m/s)²

      = 7,500,000 J

D. m = 100 kg

v = 5 m/s

K.E.=0.5 mv²

      = 0.5 (100 kg) (5 m/s)²

      = 250 J

In increasing order of kinetic energy:

B < D < A < C