Q6. The diagram below shows a girl skateboarding on a semi-circular ramp. 4.0 m The girl has a mass of 50 kg (a) Calculate the gravitational potential energy (g.p.e.) of the girl at the top of the ramp. Use the equation: g.p.e. = mass x gravitational field strength x height gravitational field strength = 9.8 N/kg g.p.e. = (2) (b) The girl has a speed of 7 m/s at the bottom of the ramp. Calculate the kinetic energy of the girl at the bottom of the ramp. Use the equation: kinetic energy 0.5 x mass x (speed) 2 (2) (c) Kinetic energy = Not all of the g.p.e. has been transferred to kinetic energy. Which two statements explain why? Tick two boxes. Some energy is wasted. The mass of the girl is too low. The ramp is not high enough. The g.p.e. of the girl is not zero. The speed of the girl is too great.