Final answer:
The kinetic energy of a 1500 kg car moving at 42 km/hr is approximately 101,717.5 J (joules).
Step-by-step explanation:
The kinetic energy of an object can be calculated using the formula:
KE = 1/2 * mass * velocity^2
In this case, the mass of the car is 1500 kg and the velocity is 42 km/hr. Before calculating, we need to convert the velocity from km/hr to m/s. There are 1000 meters in 1 kilometer and 3600 seconds in 1 hour, so 42 km/hr is equal to 42,000/3600 = 11.67 m/s.
Plugging the values into the formula:
KE = 1/2 * 1500 kg * (11.67 m/s)^2
Calculating this gives us a kinetic energy of approximately 101,717.5 J (joules).