A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially. How fast is the first canoe moving after the pitch, assuming no friction with the water?

Question

Physics

Cassie Hart

3 March, 14:00

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially. How fast is the first canoe moving after the pitch, assuming no friction with the water?

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Cheerio · Answer 1

This can be solve using momentum, where momentum = mv

where m is the mass of the object

and v is the velocity of the object

m1v1 + m2v2 = mfvf

(0.145 kg) (20 m/s) + (120 kg) (0 m/s) = (120 + 0.145 kg) vf

solve for vf

2.9 = 120.145vf

vf = 0.024 m/s