Physics Review QuestionUnit:
Work and EnergyYear:
1990 Question#:
16Question:
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 NsWhat 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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