Answer:
The correct option is (b).
Explanation:
Given that,
At the top of the hill, the kinetic energy is E and the gravitational potential energy is 3E.
We need to find the kinetic energy of the car on the ground.
We know that,
Mechanical energy = kinetic energy + potential energy
According to the law of conservation of energy, the total mechanical energy is conserved.
It means, when it coasts down to ground level, the kinetic energy is same as that on the top of the hill. Hence, the required kinetic energy on the ground is equal to 3E.
The arrow in chemical equation means 'turns into' i think
Answer:
the light will reflect parallel to the principal axis
I think the answer would be tensile, I’m sorry if it’s wrong
Since the device is a speedometer, the data it read is the speed of the racecar. Data recording involving time usually uses time as the independent variable. It was also said in the problem that it records the speed every second which shows that the time interval is constant. This means that only other data, the car's speed, is the dependent variable.
