The gravitational force between two objects depends on the masses and what factor between them
1 answer:
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Answer:
The deceleration is
Explanation:
From the question we are told that
The distance of the car from the crossing is
The speed is
The reaction time of the engineer is
Generally the distance covered during the reaction time is
=>
=>
Generally distance of the car from the crossing after the engineer reacts is
=>
=>
Generally from kinematic equation
Here v is the final velocity of the car which is 0 m/s
So
=>
Answer:
Kf = 470 mJ
Explanation:
- According the work-energy theorem, the change in the kinetic energy of one object, is equal to the net work done on it.
- Since the puck is initially at rest, the change is kinetic energy is just the final kinetic energy of the puck.
- Assuming that the net force is horizontal, and causes a horizontal displacement also, we can find the net work on the puck as follows:
- As we have already said, (1) is equal to the final kinetic energy of the puck:
- ⇒ Kf = 470 mJ (2)