How Is the Man's Mass Calculated from Throwing a Ball on Ice?

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SUMMARY

The mass of the man is calculated using the principle of conservation of momentum, specifically the equation p1 = p2. In this scenario, the man throws a ball weighing 250 grams at a speed of 8.0 m/s, resulting in a backward movement of the man at 0.05 m/s. The calculations confirm that the man's mass is 40 kg, derived from the equation 250 g * 8 m/s = m2 * 0.05 m/s.

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Homework Statement


A man is standing on a frozen pond (which is mean less).
He throws a ball m=250 g
The speed of the ball is 8.0 ms-1
The man moves back at a speed of 0.05 ms-1
How heavy is the man ?


Homework Equations



p1=p2
m1 x v1 = m2 x v2

The Attempt at a Solution



p1=p2
m1 v1 = m2 v2

250 x 8 = m2 x 0.05
2000 = 0.05 m2
m2= 40000 [g] = 40 [kg]

is this correct ?


Thanks,
dave
 
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Correct.
 

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