1.) You and your friends just finished watching Back To The Future II. Marty bor

Question

1.) You and your friends just finished watching Back To The Future II. Marty borrows a young girl's hoverboard and jumps on. Would Marty be moving faster or slower after jumping on the hoverboard? You decide to work out what Marty's speed would be before he landed on the board. Marty is about 70 kg, the hoverboard itself is 3 kg, and they move straight along the ground together with a speed of about 8 mph.

2.) The movie depicts Marty almost instantaneously moving together with the hoverboard once he's leapt on. The forces involved were applied over 90 ms. What was the magnitude of the average force on Marty as he landed on the board?

3.) What is the magnitude of the average force Marty exerts on the board?

Explanation / Answer

according to conservation of momentum

m1v1=m2v2

before jumping on to hover board speed is more

70*v=73*8

v=8.34m/s

when marty jumps onto hoverboard speed obviously decreases

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