Final answer:
To find the ratio of kinetic energies between the dump truck and the car, we can use the formula: ratio = (mass of dump truck ÷ mass of car) × [(speed of dump truck)² ÷ (speed of car)²]. Substitute the given times into the formula to find the answer.
Step-by-step explanation:
The dump truck has a certain amount of kinetic energy, and we need to calculate how many times that is compared to the car's kinetic energy.
To calculate the ratio of the kinetic energies, we can use the formula: ratio = (mass of dump truck ÷ mass of car) × [(speed of dump truck)² ÷ (speed of car)²]
Using the given times, we can substitute the ratio values into the formula to find the answer. For example, if the dump truck has 2 times more kinetic energy than the car, the ratio would be 2. Substituting this value into the formula will give you the result.