Final answer:
To calculate the kinetic energy of a 50g car, the car's mass should be converted to kilograms (0.05 kg) and we require the velocity. Without the car's velocity, the kinetic energy cannot be calculated.
Step-by-step explanation:
To calculate the kinetic energy of the car in joules, the mass first needs to be converted to kilograms. Since the mass of the car is given as 50g, we convert it to kilograms by dividing by 1000, giving us 0.05 kg. The kinetic energy (KE) of an object with mass (m) moving at velocity (v) is given by the formula KE = 0.5 × m × v². However, we do not have the velocity (v) of the car provided in the student's question, thus we cannot calculate the kinetic energy without this information.
If we assume a given velocity is provided, for example, a velocity of 30 m/s (as in the freeway speed example), then the calculation would be KE = 0.5 × 0.05 kg × (30 m/s)². Without the actual velocity, we cannot provide a numerical answer.