Question

What is the kinetic energy of a 7,500 N automobile which is moving at 55 m/s?

Answer 1

I hope this helps (:

Answer 2

Kinetic energy,
`E=1.15* 10^6\ J`

Step-by-step explanation:

It is given that,

Weight of automobile, W = 7500 N

Speed, v = 55 m/s

Since, W = mg

`m=(W)/(g)=(7500\ N)/(9.8\ m/s^2)`

m = 765.3 kg

Kinetic energy due to the motion of the automobile is given by :

`E=(1)/(2)mv^2`

`E=(1)/(2)* 765.3\ kg* (55\ m/s)^2`

E = 1157516.25 J

or

`E=1.15* 10^6\ J`

So, the kinetic energy of the automobile is
`1.15* 10^6\ J`. Hence, this is the required solution.