A 200 kilogram roller coaster car travels over the top of a 40-m high hill (Hill A) traveling at 10 meter per second. It then travels down before traveling back up the next hill (Hill B) which is 20 meter high. Let the gravitational potential energy be zero at the ground and assume that the work done by friction and air resistance on the car is negligible. Obtain the speed of the car at the top of the second hill.