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Unformatted text preview: asured his maximum running speed to jump safely on the skateboard at
6 m/s, and he wants to know how high above ground level he will make as he rolls up the slope.
He tells you his weight is 70 kg.
The first part of the problem is an inelastic collision; your moving friend collides with and sticks
to a skateboard. Using conservation of momentum, you can find the speed that your friend will
move with while on the skateboard. The second part of the problem uses energy conservation.
The kinetic energy your friend has with his skateboard becomes gravitational potential energy as
he moves up the incline. You can find the height that he reaches by equating the gravitational
potential energy at the highest point, where the skateboard has ceased motion, to the kinetic
energy of your friend on the board when he is on the level section of the track. You should
obtain a height of 1.52 m. Review: Elastic Collisions. Low Speed Crash. Solution
A 1000 kg car going 3 m/sec overtakes and collides with a truck of mass 2000 kg going 1 m/sec.
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- Spring '09