Unit: Mechanics
Year: 1988 Question#: 7
Question: An object with a mass of 0.5 kilogram starts from rest and achieves a maximum speed of 20 meters per second in 0.01 seconds. What average unbalanced force accelerates this object?
(1 ) 1,000 N
(2 ) 10 N
(3 ) 0.1 N
(4 ) 0.001 N
What is this question really asking?
Explanation by: Anna R
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Answer 1
1,000 N
CORRECT
You can manipulate the formula F
t=m
v by dividing both sides by 
t to get F (force) alone on one side. Then plug in the numbers given.F=(0.5kg)(20m/s) / 0.01sec.) =1000N return to top
Answer 2
10 N
INCORRECT
You can manipulate the formula F
t=m
v by dividing both sides by 
t to get F (force) alone on one side. Then plug in the numbers given.return to top
Answer 3
0.1 N
INCORRECT
You can manipulate the formula F
t=m
v by dividing both sides by 
t to get F (force) alone on one side. Then plug in the numbers given.return to top
Answer 4
0.001 N
INCORRECT
You can manipulate the formula F
t=m
v by dividing both sides by 
t to get F (force) alone on one side. Then plug in the numbers given.return to top
What's this question really asking?
What is the formula for impulse and momentum and do you know how to plug in the numbers and manipulate it? return to top
