Physics Review Question Unit: Work and Energy Year: 1990 Question#: 16 Question: A constant braking force of 10 newtons applied for 5 seconds is used to stop a 2.5 kilogram cart traveling at 20 meters per second. The magnitude of the impulse applied to stop the cart is (1 ) 10 Ns (2 ) 30 Ns (3 ) 50 Ns (4 ) 100 Ns What is this question really asking? Explanation by: derek N [ Return to question menu ] Answer 1 10 Ns INCORRECT This is not a possible answer. Use the formula for impulse to solve. J=Ft. Beware of all the extra information in this problem return to top Answer 2 30 Ns INCORRECT This is not a possible answer. Use the formula for impulse to solve. J=Ft. Beware of all the extra information in this problem return to top Answer 3 50 N x s CORRECT Using the formula for impulse J= Ft J= 10N x 5s J = 50 Ns Nice job of avoiding all the extra information in this problem. return to top Answer 4 100 Ns INCORRECT Try using the formula for impulse J = Ft Beware of all the extra information in this problem. return to top What's this question really asking? What is the amount of impulse contained in a 10N force if applied to a cart for 5 seconds? return to top |
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