A car of mass 800kg travels at 70km/h for 10 minutes. Find its kinetic energy
Someone told me 150544 J.
I am not sure if that is correct though : /
KE = 1/2*m*v^2
To find the kinetic energy of the car, we can use the formula:
Kinetic Energy = 1/2 * mass * velocity^2
First, let's convert the given velocity from km/h to m/s:
1 km = 1000 m
1 hour = 3600 seconds
Therefore, 70 km/h can be converted to:
70 km/h * (1000 m/1 km) * (1 hour/3600 seconds) = 19.44 m/s
Now that we have the velocity in m/s, we can substitute it into the formula along with the given mass:
Kinetic Energy = 1/2 * 800 kg * (19.44 m/s)^2
Calculating this:
Kinetic Energy = 1/2 * 800 kg * (19.44 m/s)^2 = 150796.8 Joules
So, the kinetic energy of the car is 150796.8 Joules.