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2 answers:
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Answer:
The acceleration of the sled is "0.49 m/s²". A further explanation is given below.
Explanation:
The given values are,
Speed,
V = 4.0 m/s
Coefficient of kinetic friction,
μ = 0.05
As we know,
⇒
and,
⇒
On substituting the given values, we get
⇒
⇒
Answer:
v_average = 15 m / s
Explanation:
The average speed can be found in two ways,
* taking the distance traveled and divide it by the time spent
* taking the velocities in each time interval and then finding the weighted average by the time fraction
v_average = 1 / t_total ∑ vi ti
Let's apply this last equation
Total time is
t = t₁ + t₂
t = 10 + 10 = 20 min
v_average = 10/20 10 + 10/20 20
v_average = 10/2 + 20/2
v_average = 15 m / s