Panel A shows a ball shortly after being thrown upward. Panel B shows the same ball in an instant on its way down. Suppose air r
esistance can be ignored. Which statement is true? a) Both potential and kinetic energy are higher in Panel A than in Panel B. b) Both the potential and kinetic energy are higher in Panel B than in Panel A. c) The potential energy is higher in Panel A, but the kinetic energy is higher in Panel B. d) The potential energy is higher in Panel B, but the kinetic energy is higher in Panel A.
1 answer:
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Answer:
1.
2.
Explanation:
1. According to Newton's law of motion, the puck motion is affected by the acceleration, which is generated by the push force F.
In Newton's 2nd law: F = ma
where m is the mass of the object and a is the resulted acceleration. So in the 2nd experiment, if we double the mass, a would be reduced by half.
Since the puck start from rest, in the 1st experiment, to achieve speed of v it would take t time
Now that acceleration is halved:
You would need to push for twice amount of time
2. The distance traveled by the puck is as the following equation:
So if the acceleration is halved while maintaining the same d:
As , then
. Also
So t increased by 1.14