What is the kinetic energy of an object that has a mass of 20kilograms and a speed of 2.8?

Answer 1

I believe it would be an application of E=mc2 except instead of c which is the speed of light we use v which is the speed of the car. so E will be KE in this case m will be 2000kg and v = 20 ms.

KE=mv2

KE=(2000 kg)(20m/s)^2

KE=(2000 kg) (400 m2/s2)

KE = (800, 000 J) or 800 kJ

Answer 2

Kenetic energy is given by the formula K= .5mv^2

Where m is the mass in Kg

V is the velocity in meters per second

K is the energy in Joules

so for ur set of numbers assuming that speed is in meters per second

K=.5(20)(2.8^2) = 78.4 J

Answer 3

Kinetic energy = 1/2 M V2 .

To make the units consistent, we only have to change the 2.8 miles to meters.

1 mile = 1,609.344 meters

2.8 miles = 4,506.1632 meters

KE = (1/2) (20) (4,506.1632)2 = 2.031 x 108 joules (rounded)

Answer 4

The kinetic energy is 78.4 kg x m^2 / s^2, or 78.4 Joules.