A car with a mass of 900 kg is moving with a speed of 60 kph. Calculate the kinetic energy of
the car in J (3 points).
A) 125000 J
B) 7500 J
C) 27000 J
D) 1620000 J

Please provide solution

Question

A car with a mass of 900 kg is moving with a speed of 60 kph. Calculate the kinetic energy of 
the car in J (3 points).
A) 125000 J
B) 7500 J
C) 27000 J
D) 1620000 J

Please provide solution

Vocaloid · Answer

kinetic energy = (1/2)mv^2

**however** since our energy unit is in joules, we have to convert kph to m/s.

$$\frac{ 60~km }{ 1~hr }\frac{ 1~m }{ 1000km }\frac{ 1~hr }{ 3600s }$$
notice how km and hours cancel out and you're left with m/s
once you have the speed in m/s, plug into the KE formula