Answer:
20 Joules
Explanation:
Mechanical Energy is the sum of kinetic and potential energy.
Since energy can only be transferred and cannot be lost, kinetic energy=potential energy.
Now we only need to use one of the formulas to find the answer. In this answer I'll be using the formula for potential energy which is mass × gravitational field strength ×height.
Substitute the values in and using gfs=10, the answer will be 20J.
Velocity of Deidre and her dog is 2.11m/s.
<h3>What is velocity?</h3>
- Velocity is the rate of change of position of an object in a particular frame of reference
- Mathematically, velocity of an object = Displacement of the object/time taken
<h3>What is velocity of Deidre and her dog ?</h3>
- The distance covered by Deidre and her dog is 95 meter towards north.
- The time taken to cover the distance is 45 second.
- So velocity of Deidre and her dog =95/45
=2.11m/s
Thus , we can conclude that the velocity of Deidre and her dog is 2.11 m/s towards north .
Learn more about velocity here :
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Answer:
Option A
Explanation:
At segment T-U, the substance changes from a liquid to a gas and does not change temperature.
The reason is because latent heat of vaporisation allows for the absorption of heat in the change of state and temperature remains constant until it has fully changed state.