a cyclist applies a constant forward force of 20 N to maintain a velocity 2.5 m/s. how much power does the cyclist deliver?
1 answer:
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Answer:
4m (with the assumption that the deceleration is same in both cases)
Explanation:
The third equation of a uniformly decelerated motion is used in solving this problem.
where v is the final velocity, u the initial velocity, s the distance covered and a the deceleration.
The negative sign is due to the fact that the body under consideration is decelerating.
Given;
u = 0.5m/s
v = 0m/s (because it comes to rest)
s = 1m
a = ?
Substituting all values into equation (1);
Assuming the block maintained this same deceleration, but with an initial velocity of 1m/s, then the distance travelled would be as follows;
u = 1m/s
v = 0m/s
s = ?
a =
By still using equation (1), we obtain the following;