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After skiding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of 2.0 m/s. Miranda runs after her at a velocity of 4.9 m/s and hops on the inner tube. How fast do the two of them slide across the snow together on the inner tube?

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Question

Assume mass of Ashley as 60 kg and Miranda 70 kg

Answer:

3.56 m/s

Explanation:

From law of conservation of linear momentum, the sum of initial momentum equals the sum of final momentum.

Momentum, p=mv where m is mass and v is velocity. In this case

M1v1+m2v2=(m1+m2)v where v is common velocity in question.

60*2+70*4.9=(60+70)v

V=3.56 m/s

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