a force of 10N acts on a body of mass 1kg at rest. The work done by the body in 4s is
A)80J
B)800J
C)8J
D)8000J
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Answer :-
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Firstly, recall the Momentum-Force Equation:
p = Ft
Substitute known variables into the equation.
p = ( 10.0 ) × 4
Solve for momentum.
p = 40 Ns.
______________
Secondly, recall the Momentum Equation:
p = mv
Substitute known variables into the equation.
40.0 = 4 v
Solve for velocity.
v = 10 m / s
____________
Thirdly, recall the Power-Force Equation :
P = Fv
Substitute known variables into the equation.
P = 10 × 10
Solve for power.
P = 100 w
____________
Next, recall the Work-Power Equation:
W = Pt
Substitute known variables into the equation.
W = 100 × 4
Solve for work.
W = 400 J
_____________
•°• The answer is 400 J
_______________________________
Thanks!
_____________________________
Firstly, recall the Momentum-Force Equation:
p = Ft
Substitute known variables into the equation.
p = ( 10.0 ) × 4
Solve for momentum.
p = 40 Ns.
______________
Secondly, recall the Momentum Equation:
p = mv
Substitute known variables into the equation.
40.0 = 4 v
Solve for velocity.
v = 10 m / s
____________
Thirdly, recall the Power-Force Equation :
P = Fv
Substitute known variables into the equation.
P = 10 × 10
Solve for power.
P = 100 w
____________
Next, recall the Work-Power Equation:
W = Pt
Substitute known variables into the equation.
W = 100 × 4
Solve for work.
W = 400 J
_____________
•°• The answer is 400 J
_______________________________
Thanks!
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