1. A cart of mass 4 kg moves at a speed of 10 m/s to the right when it encounters a horizontal spring of spring constant 250 N/m. The maximum potential energy stored the spring in bringing the cart to rest is (A) 80 J (B) 200 J (C) 280 J (D) 400 J
2. For the same car and spring as the previous problem, what is the maximum compression distance of the spring?
(A) 1.26 m (B) 1.6 m (C) 2.5 m (D) 8 m