Question

Three rocks are rolling down a hill at the same speed. Rock 1 has a mass of 1 kg, rock 2 has a mass of 1.5 kg, and rock 3 has

a mass of 3 kg. Which rock has the most kinetic energy?
1
2
rock 1
O rock 2
rock 3
all three rocks have the same kinetic energy

Answer 1

rock 3

Step-by-step explanation:

Rock 3 has the greatest kinetic energy because it has the most mass.

Kinetic energy is the energy due to the motion of a body.

Given mass:

Rock 1 = 1kg

Rock 2 = 1.5kg

Rock 3 = 3kg

Now, to calculate kinetic energy;

K.E =
`(1)/(2)` m v²

where m is the mass

v is the velocity

As we can see, kinetic energy is directly proportional to mass.

The higher the mass, the higher the kinetic energy.