You can exert a total of 75 J to launch a 0.75 kg projectile up a 5 m long ramp. The coefficient of kinetic friction between the projectile and the ramp is 0.2 and the ramp is set at a 60° angle relative to the ground.
What is the total distance (in m) traveled by the projectile, as measured from its initial position at the bottom of the ramp.
Also, What energy (in J) must you exert for the projectile to travel twice the distance?