Help with 14,15

14. A truck with a mass of 2.00 x 104 kg is travelling at 100.0 km/h. If the driver reduces the truck's speed to 50.0 km/h, then the truck's kinetic energy has changed by s to dipnal ord al dorW .er A) 5.79 x 106 J B) 1.39 x 105 J a.I al noom ord no p) fe P.8 2i noom srid no bored C) 9.18 x 106 J D) 3.78 x 106 J m ce.0 (8 m $8.0 0 15. A bungee jumper who jumps from a 100.0 m high platform stops at a distance of 8.0 m from the ground. The energy transformations would best be described as A) Ep changes to Ek, then changes to Ep with no loss of energy due to friction. B) Ep changes to Espring with a loss of energy due to friction. C) Ep changes to Ek, then changes to Espring with a loss of energy due to friction. D) Ep changes to Ek, then the final energy is 0