Marty is trying to escape getting pummeled by a group of bullies. He borrows a y

Question

Marty is trying to escape getting pummeled by a group of bullies. He borrows a young girl's hoverboard and jumps on. You assume that Marty is about 70 kg and that the hoverboard is itself about 5 kg and that they move straight along the ground together with a speed of about 10 mph. His speed before landing on the baord is 4.79m/s.

what forces is responsible for the change in Marty's speed and also the change in the hoverboards speed kinetic friction,static friction, gravity the normal force, centripetal force the force of momentum , or none of the choices

Explanation / Answer

Since there is no friction between the ground and the hoverboard.

we can asume this case as a totally inelastic collision, so a portion of the mechanical energy is lost.

Marty jumps on the table and lands whitout sliping so, there is friction between the board and marty`s feets, this friction is static, but this force cant make any work since the displacement is zero.

The change in the speed is due to a impact force, this force produces an impulse, the impulse generate a change in the linear momentum

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