A car moving at a speed of 20m/s has a kinetic energy of 300,000). What is the car's mass?
The formula for kinetic energy is given by:
Kinetic Energy = (1/2) * mass * velocity^2
Given that the kinetic energy (KE) is 300,000 J and the velocity is 20 m/s:
300,000 J = (1/2) * mass * (20 m/s)^2
Rearranging the formula and solving for mass:
mass = (2 * KE) / (velocity^2)
mass = (2 * 300,000 J) / (20 m/s)^2
mass = (2 * 300,000 J) / 400 m^2/s^2
mass = 600,000 J / 400 m^2/s^2
mass = 1500 kg
Therefore, the car's mass is 1500 kg.