At what speed does a 1800 kg compact car have the same kinetic energy as a 15000 kg truck going 21 km/h ? express your answer in kilometers per hour.

v = 60.62 km/h

Explanation:

Kinetic energy

Kinetic energy is that which is due to the movement of bodies and is calculted like this:

K = (1/2)mv² Formula (1)

Where:

K : Kinetic energy (J)

m: mass (kg)

v : speed (m/s)

Data for the truck

m = 15000 kg

v= 21 km/h = 21 *(1000m)/ (3600s)

v= 5.83 m/s

Calculation of the kinetic energy of the truck

We replace data in the formula (1)

K = (1/2)mv²

K = (1/2)(15000)(5.83)²

K = 255208.3 J

Data for the compact car

K = 255208.3 J =  255208.3 (N*m)

m = 1800 kg

Calculation of the speed  of the compact car

We replace data in the formula (1)

K = (1/2)mv²

255208.3 = (1/2)( 1800)(v)²

255208.3 = ( 900)(v)²

v² = 255208.3 / ( 900)

v = 16.84 m/s

1 km = 1000 m

1 h = 3600 s

v = 16.84*(3600/1000)km/h

v = 60.62 km/h

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this