A car has the same kinetic energy when it is traveling south at 30 m/s as when it is traveling northwest at 30 m/s. Is the momentum of the car the same in both cases? Explain.
Solution 4DQ Step 1: In the 1st case, the car was moving with a speed of 30 m/s towards south. And in the 2nd case the same car is moving towards north-west with the same speed of 30 m/s. The momentum by the definition of newtonian mechanics is mass times velocity. So, the magnitude of momentum in both the cases is same, as the same mass moving with the same speed.