Question

Which example has the least kinetic energy

Question 2 options:

a 100 kg rock rolling down a hillside at 100 m/s.


a 100 kg rock rolling down a hillside at 1 m/s.


a 10 kg rock rolling down a hillside at 100 m/s.


a 1 kg rock rolling down a hillside at 1 m/

Answer 1

D

Step-by-step explanation:

Let’s calculate the kinetic energy for all of the choices.

a. (1/2)(100)(100)^2 = 50(10000)=500,000

b. (1/2)(100)(1)^2 = 50

c. (1/2)(10)(100)^2 = 5(10000) = 50,000

d. (1/2)(1)(1)^2 = 0.5

We can see that (d) has the least kinetic energy.