A box of mass 4.0 kg is accelerated from rest by a force across a floor at a rate of 2.0 m/s2 for 7.0 s. Find the net work done on the box.
Work done on the box.
Answer to Problem 9P
Solution:
Explanation of Solution
The work it can do on the box can be calculated first by calculating the distance covered by the box in 7 s. For this, we can say that the initial speed of the box is zero.
Given:
Mass of the box,
Acceleration,
Time,
Formula used: Second equation of motion:
Where, s is the distance covered by the box
u is the initial speed of the box ( u= 0)
ais the acceleration
tis the time
Newton’s second law of motion:
Where F is the Force required to move the box.
m is the mass of the box
ais the acceleration
Work done:
Where, F is the Force required to move the box
W is the work done on the box
sis the distance.
Calculation:
The distance covered by the box
Conclusion:Work done on the boxis
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Physics: Principles with Applications
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