A 5000-kg car accelerated from rest to 20 m/s. Determine the net work done on the car.
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Answer:
1000,000 Joule
Explanation:
According to Newton's second law, a net force applied to the object causes acceleration of the object. The work-energy principle states that the work done by the net external force causes change in kinetic energy of the object.
Answer and Explanation:
Given Data
mass of Car,
m = 5000 k g
initial speed of car,
u = 0 m / s
final speed of car,
v =20 m /s
Wnet = ΔEK
Wnet = ½ m (vt2 – vo2)
Wnet = net work
ΔEK = the change in kinetic energy
m = mass (kg),
vt = final speed (m/s),
vo = initial speed (m/s).
Net work :
Wnet = ½ m (vt2 – vo)
= ½ (5000)(202 – 02)
= (2500)(400 – 0)
= (2500)(400)
= 1000,000 Joule
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