Answer:
time machine popularized the concept of time travel by mechanical means. Yes a long time ago, mahal
6: Short way: it cannot be 2.5, 3, or 5 because up to 5 seconds it only has positive velocity so it must be moving forwards.
Long Way: Velocity is in m / s, multiply that by time (s) to get m or displacement. From 0->5 you have a triangle under the curve, (1/2)(5)(20) = 50 meters displaced positive, you need to then look when velocity is under the curve and use a similar equation to solve for the area but make the answer negative. Find the point where it equals -50 and that is where it will have returned.
Answer to 6: B
7. I cannot see the problem enough to answer this. Just know if the line is above 0 velocity is positive so it is moving the direction it started, when it goes below 0 velocity is negative so it is moving opposite direction it started.
8. Accelration is change in velocity. Whatever the slope of the velocity graph is acceleration. At t=8 the slope is 0 because it is not going up or down.
Answer to 8: A
Answer:
y = 3.159 m
Explanation:
Using the second equation of motion.
s = ut + 0.5at^2 .......1
Since the ball is thrown upward the acceleration due to gravity act against it.
Given:
distance s = y
Initial speed u = 12.0 m/s
Time t = 0.30 s
Acceleration a = -g = -9.8m/s^2
Equation 1 becomes;
y = ut - 0.5at^2
Substituting the given values. We have;
y = 12.0(0.30) - 0.5(9.8 × 0.3^2)
y = 3.6 - 0.441
y = 3.159 m
The answer is B, because when the frequency increases the wavelength becomes half the length it was before.
a). The truck's distance covered for the trip is
(60) + (60 - 15) = 105 kilometers .
b). Its displacement for the whole trip is the distance
and direction from the start-point to the end-point.
15 kilometers east .
