A 20-kg barrel is rolled up a 20-m ramp to the back of a truck whose floor is 5.0 m above the ground. What work is done in loadi
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Answer:
Approximately , assuming that the rocket had no propulsion onboard, and that air resistance on the rocket is negligible.
Explanation:
Initial velocity of this rocket: .
When the rocket is at its maximum height, the velocity of the rocket would be equal to . That is:
.
The acceleration of the rocket (because of gravity) is constantly downwards, with a value of .
Let denote the distance that the rocket travelled from the launch site to the place where it attained maximum height. The following equation would relate
to
,
, and
:
.
Apply this equation to find the value of :
.
In other words, the maximum height that this rocket attained would be .
Again, assume that the air resistance on this rocket is negligible. The rocket would return to the ground along the same path, and would cover a total distance of .
