Question

If a car travels at 80ft/s. What is the Kinetic Energy of the car if mass of the car is 18kg​

Answer 1

216J

Step-by-step explanation:

Given parameters:

Velocity of the car = 80ft/s

Mass of car = 18kg

Unknown:

Kinetic energy of the car =?

Solution:

Kinetic energy is the energy in motion of a body. It can be derived using the expression below:

K.E =
`(1)/(2) m v^(2)`

where m is the mass

v is the velocity

To solve, convert 80ft/s to m/s;

1ft/s = 0.3m/s

80ft/s = 80 x 0.3 = 24m/s

Now insert parameters and solve;

k.E =
`(1)/(2)` x 18 x 24 = 216J