Nuclear Reactions: Please answer numbers 4,5,6.
1 answer:
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Answer:
The average velocity is 40km/h.
Explanation:
The average velocity is , where
is the distance traveled and
the time elapsed.
The distance traveled is clearly 80km since it's all done in the same direction, we only need to know the time elapsed. For this we calculate the time elapsed on the first part, and add it to the time elapsed on the second part using always the formula , where v is the velocity on each part, which is constant.
The time elapsed for the first part is , and the time elapsed for the second part is
, giving us a total time of
=2h.
Finally, we can calculate the average velocity: .
Answer:
0.85m
Explanation:
Given parameters:
Height of fall = 3.5m
Unknown:
Duration of fall = ?
Solution:
To solve this problem, we apply the right motion equation.
Since we know the height, we can use the equation below;
S = ut +
S is the height
u is the initial velocity = 0m/s
t is the time
g is the acceleration due to gravity
3.5 = 0 + x 9.8 x t²
3.5 = 4.9t²
t² =
t² = 0.71
t = √0.71 = 0.85m