Question

A car (m= 800kg) drives with a speed 100 km/h. Calculate the kinetic energy!
1. The kinetic energy of the car is 308,6 kJ.
2. The kinetic energy of the car is 380,4 kJ.
3. The kinetic energy of the car is 360,0 kJ.

Answer 1

A car
mass-800kg
speed-100km/h=100×1000/3600
27.7m/s
k.E.=?
kinetic energy=1/2m×v×v
=1/2×800×27.7×27.7
=306906j
=306.9

Answer 2

100 km/h = 100*1000/3600 m/s = 27.78 m/s

KE = 1/2 * m*v2 = (1/2)*800*27.78*27.78 = 308666J = 308.6 KJ