3. A 1200 kg car is riding on Goliath(a roller coaster) with a speed of 4 m/s. After falling 95 meters, the car goes into a 35 meter tall loop. (a) Assuming that all forces involved are conservative, what is the velocity of the car at the top of the loop? (b) If a non-conservative force of 95000 J slows the car as it is moving along the track, how fast will the car be moving at the top of the loop?