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suppose that you are pushing a small refridgerator of mass 50 kg on wheels . You push with force of 100N.

(A) What is the refrigerator acceleration . (B) Assume the refigerator starts at rest . How long will the refrigerator accelerate at this rate before it gets away from you , that is moving faster than you can run on the order of 10m/s?

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Eric Y. | SAT PrepSAT Prep
5.0 5.0 (5 lesson ratings) (5)
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Force = mass * acceleration
F = ma
 
(A)
a = F/m =100/50 = 2m/s2
This means every second, the velocity increases by 2m/s
 
(B) The velocity is increasing by 2m/s every second and starts at 0.
 
v = a*t
10 = 2*t
t = 5 seconds