When divided by △t, (vf - vi) is used to determine which characteristic? A.Speed B.Direction C. Displacement D.Acceleration
1 answer:
Answer:
D.Acceleration
Explanation:
The acceleration of an object is defined as:
where
vf is the final velocity of the object
vi is the initial velocity of the object
is the time taken for the change in velocity to occur
Therefore, from the formula, we see that if we divide (vf - vi) by △t, we get the acceleration.
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Answer:
The system's potential energy is -147 J.
Explanation:
Given that,
Energy = 147 J
We know that,
System is isolated and it is free from external forces.
So, the work done by the external forces on the system should be equal to zero.
We need to calculate the system's potential energy
Using thermodynamics first equation
Put the value into the formula
Hence, The system's potential energy is -147 J.