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
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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?
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