Physics Review Question Unit: Mechanics Year: 1989 Question#: 17 Question: What is the magnitude of the velocity of a 25-kilogram mass that is moving with a momentum of 100. kilogram-meters per second? (1 ) 0.25 m/s (2 ) 2500 m/s (3 ) 40. m/s (4 ) 4.0 m/s What is this question really asking? Explanation by: Anna R [ Return to question menu ] Answer 1 0.25 m/s INCORRECT The formula for momentum is p=mv (p=momentum), ....try it again. return to top Answer 2 2500 m/s INCORRECT The formula for momentum is p=mv (p=momentum), ....try it again. return to top Answer 3 40. m/s INCORRECT The formula for momentum is p=mv (p=momentum), ....try it again. return to top Answer 4 4.0 m/s CORRECT The formula for momentum is p=mv (p=momentum), ....so p=mv 100kgm/s=25kg(v) v= 4m/s. return to top What's this question really asking? How do you find velocity when you have the momentum and the mass of an object? return to top |
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