Answer:
Thus, the velocity at the time of strike is same as the velocity at the time of projection.
Explanation:
Let a projectile is projected vertically upwards with a speed of u and reaches to the maximum height H.
At maximum height , the speed is zero and then the projective comes back on the ground.
Use the third equation of motion
Now let the velocity at the time of strike is v'.
Use third equation of motion, here initial velocity is zero.
Thus, the velocity at the time of strike is same as the velocity at the time of projection.
Answer:
im pretty sure thats called friction, or did you mean something else?
Answer:
See description below
Explanation:
Given
Applied Force = 50N
Expected Appled Force = 350N
Difference = 350N - 50N
Difference = 300N
The frictional force will remain unchanged after the applied force gets to 300N.
At this point, the reason why the Net force is not zero (0) is because of the amount of force that is applied.
Also, since the frictional force is less than the applied force, the body will move in the right direction before it gets to 300 N the force of friction equals the applied force.
Actually, two of the statements can be argued to be true:
1)Changing several different factors in an experiment takes too many controls.
This means that for every factor that is changed you need a control which has all the other factors stable - but with many factors, this might be undoable.
2) - and this is the best answer:
When only one factor is changed, you can be more certain that it caused the results.
If this factor is the only thing that changes, you can safely assume that it caused the results!