Answer:
t_a = 7 s
t_w = 5 s
Step-by-step explanation:
Given:
- The average speed in air v_a = 16 m/s
- The average speed in water v_w = 3 m/s
- The total distance D = 127 m
- The total time T = 12 s
Find:
How long did the stone fall in air and how long did it fall in the water?
Solution:
- Lets time taken by stone to drop through air as t_a = t_a.
- The time taken in water would be t_w = (12 - t_a)
- The total distance covered can be calculated as:
D = v_a*t_a+ v_w*(12 - t_a)
127 = 16*t_a + 3*(12 - t_a)
Simplify and solve for t:
91 = 16*t_a - 3t_a
13*t_a = 91
t_a = 7 s
t_w = 5 s
For the first one it's 90.5, I know cause I just took the test and it's right. The second one I'm not sure..
Answer:
19/24
Step-by-step explanation:
5/12 + 3/8
LCM: 24
(5×2 + 3×3)/24
(10 + 9)/24
19/24
Answer:
find using calculator:)
Step-by-step explanation:
pie X (25 divided by 2) X (25 divided by 2) = answer
12-3=9
30+7=37
I believe you just plug in any two numbers that will come out to 9 when subtracted or 37 when added.
