Question

a truck of mass 5000 of traveling at 40 m/s is brought to rest by applying brakes. the truck comes to rest after traveling 20m after the application of brakes.what is the kinetic energy of the truck?​

Answer 1

k.E of truck is zero

Explanation:

a body in rest does not posses kinetic energy

Answer 2

Hola ⚘⚘

Answer:

• Kinetic energy of truck = 4*10^6 J

Explanation:

Given:

• A truck of mass 5000kg travelling at 40m/s is brought to rest by applying breaks

• the truck comes to rest after travelling 20m after the application of break

Tofind:

• what is the kinetic energy of truck 

Calculation:

We have,

• v = 0 m/s

• u = 40m/s

>> K.E = 1/2 m u^2

>> K.E = 1/2 * 5000 * 40^2

>> K.E = 1/2 * 5000 * 40 * 40

>> K.E = 5000 * 20 * 40

>> K.E = 4*10^6 J

Kinetic energy of truck is 4*10^6 J $\:$