Er is practising a sequence of tricks at the local skate park on a half- pipe. The total mass of the skateboarder and skateboard is 75 kg. The skater leaves
point A 2.4 m above the ground. He skates down the ramp towards point B. He
reaches Point 3, 1.6 m above the ground, with a speed of 3,75 m s'just by rolling
along and without using his feet to push himself along the half-pipe.
The skateboarder has not oiled the wheels of his skateboard for some time, so there
is signincant friction between the axles and the wheels of the skateboard.
2.4 m
B
1,6m
7. State in words, the work energy theorem
(2)
72 Calculate the work done by the gravitational force on the skateboarder as he (4)​