Which of the following has a higher kinetic energy? A 1000 kg car rolling at a speed of 5 m/s across the floor or a 1500 kg hippo swimming at a speed of 2 m/s
A)their kinetic energies are equal
B)the car
C)the hippo
D)not enough information to determine
To determine which of the two has higher kinetic energy, we can use the formula for kinetic energy:
KE = 0.5 * mass * velocity^2
For the car:
KE_car = 0.5 * 1000 kg * (5 m/s)^2
KE_car = 0.5 * 1000 kg * 25 m^2/s^2
KE_car = 5000 J
For the hippo:
KE_hippo = 0.5 * 1500 kg * (2 m/s)^2
KE_hippo = 0.5 * 1500 kg * 4 m^2/s^2
KE_hippo = 3000 J
Therefore, the car has a higher kinetic energy at 5000 J compared to the hippo at 3000 J. The correct answer is B) the car.