Question

C: Calculate the kinetic energy of a car with a mass of 1563 kilograms that is traveling at 42 kilometers per hour.

HELP PLEASEE

Answer 1

Hello!

C. KE ≈ 9120.105 J

D. m = 151.45 kg

Question C:

Calculate kinetic energy using the formula:

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

Substitute in the given mass. We have to convert kilometers to meters in order to solve.

`(42km)/(1hr) * (1hr)/(3600sec) *(1000m)/(1km) = 11.67 m/s`

Use the equation above:

KE = 1/2(1563)(11.67)

KE ≈ 9120.105 J

Question D:

Plug in the given Kinetic Energy and velocity to solve. Convert kilometers/hour to meters/second:

`(7km)/(1hr) * (1hr)/(3600sec) *(1000m)/(1km) = 1.94 m/s`

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

285 = 1/2(m)(1.94²)

570 = (1.94²)m

151.45kg = m