<span>a. How much time elapses from start to stop
v = u + at
20 = 0 + 2t1
t1 = 10 sec
2nd phase:
v = u - at
0 = 20 - 1 x t2
t2 = 20 sec
total time = t1+t2 = 10 + 20 = 30 sec
b.</span><span>1st phase:
s = ut + 1/2at^2
s1 = 0 + 1/2 x 2 x (10)^2
s1 = 100 m
</span><span>2nd phase:
By s = ut - 1/2at^2
s2 = 20 x (20) - 1/2 x 1 x (20)^2
s2 = 200 m
total distance(s) = s1+s2 = 100 + 200 = 300 m
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hope this helps
Velocity = displacement (distance)/time
v=80m/4s
v=20m/s
velocity = 20 meters per second
Acceleration = (end speed minus beginning speed) divided by (time for the change).
Answer:
Any artidiodactyls such as hoofed animals. Deer, camels, cows, pigs, hippos are just some that are closely related to the whale.
Answer:
697 m
Explanation:
From the question above,
Note: Alice hears the splash of the rock in the well through the help of echo.
Applying,
v = 2x/t........................ Equation 1
Where v = speed of sound, x = depth of the well, t = time.
make x the subject of the formula in equation 1
x = vt/2................... Equation 2.
Given: v = 340 m/s, t = 4.1 s
Substitute these values into equation 2
x = 340(4.1)/2
x = 697 m.
