B is the answer because the area between the velocity time graph and the x-axis is the distance traveled. If you look at the velocity time graph from 0-2, seconds you will see an area of 40m. Only choice B matches that at 2 seconds, the distance traveled is 40m. You can go on to confirm the remaining trip matches that of B by calculating the 2-4 seconds of the velocity time graph area between the x-axis and graph as -40m (negative because area is under the x-axis). Again, it matches graph B, showing that the total distance traveled is 0 for the entire trip.
Answer:
impulse acting on it
Explanation:
The impulse is defined as the product between the force applied to an object (F) and the time interval during which the force is applied ():
We can prove that this is equal to the change in momentum of the object. In fact, change in momentum is given by:
where m is the mass and is the change in velocity. Multiplying and dividing by , we get
and since is equal to the acceleration, a, we have
And since the product (ma) is equal to the force, we have
which corresponds to the impulse.
That depends on what the sound is traveling through, and the density
and temperature of the substance.
In dry air, at sea-level pressure and 68° F, the speed of sound is
about 340 meters per second (761 miles per hour).