Question

Force Pushing Box-Change in Kinetic Energy
Various similar boxes are being pushed for 10 m across a floor by a ner horizontal force as
shown below. The mass of the boxes and the net horizontal force for each case are given in the
indicated figures
Rank the change in kinetic energy for each box from the greatest change in kinetic energy to
the least change in kinetic energy. All boxes have an initial velocity of +10 m/s (+ direction is to
the night and to the left with - 4 <-2).
A
C
F=75 N
F= 100 N
A-SON
JOS
15 kg
20 kg
D
F-75 N
F = TOON
FOTOD N
10 kg
2013
Greatest
Least
Or, all changes in kinetic energy are the same.
Please carefully explain your reasoning-​

Answer 1

Answer:

Explanation:

2) Given that,

m=0.05 and v=20m/s

1

Maximum potential energy at highest point= Initial kinetic energy at the bottom point

∴Maximum potential energy =

2

1

mv

2

=

2

1

×0.5×20×20

=

2

200

=100J

3) Given that,

m=0.05 and v=20m/s

1

Maximum potential energy at highest point= Initial kinetic energy at the bottom point

∴Maximum potential energy =

21 mv 2

= 21×0.5×20×20= 2200

=100J

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