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You stand on a skateboard at rest and throw a rock at 5 m/sec. You move back at 0.5 m/sec. What is the combined mass of you and the skateboard.

Respuesta :

Answer:

Explanation:

Given

Rock thrown with a speed of [tex]v_1=5\ m/s[/tex]

Speed of person and skateboard [tex]v_2=-0.5\ m/s[/tex] (moves backward)

Suppose m is the mass of stone and M is the mass of person and skate board

conserving momentum as there is no external force applied

Initial Momentum is zero

[tex]0=m(5)-M(0.5)[/tex]

[tex]M=10 m[/tex]

thus mass of Person and skate board is 10 times the mass of stone

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