"Zero acceleration" means "velocity" that's not changing.
Sadly, it seems that both of these words are almost always
misinterpreted and misunderstood. "Acceleration" does NOT
mean "speeding up", and "velocity" does NOT mean speed.
"Velocity" is the speed AND direction of motion. So, for example,
'30 miles per hour north' and '30 miles per hour west' are the same
speed but different velocities.
"Acceleration" is ANY change in speed OR direction. Consider three
different families in three different cars. One car is speeding up, one is
slowing down, and the third is driving around a curve at a steady speed.
ALL three of the cars are accelerating.
Answer:
<h2>50m/s^2</h2>
Explanation:
Step one:
given data
initial velocity u= 0m/s since the ball is at rest
time of contact t= 0.3s
final velocity v=15m/s
Required
acceleration a
from the first law of motion
v=u+at
substitute our given data
15=0+a*0.3
15=0.3a
divide both sides by 0.3
a=15/0.3
a=50m/s
<u>The average acceleration is 50m/s^2</u>
Answer:
The kinetic energy is 16 joules.
Explanation:
Kinetic energy (E) is given by:
Where:
m: is the mass
v: is the speed
When the kinetic energy is 4 joules, the speed of the object is:
Now, if the speed is increased twice then we have:
![E_{2} = \frac{1}{2}mv_{2}^{2} = \frac{1}{2}m(2v_{1})^{2} = \frac{1}{2}m[4(\frac{8}{m})] = 16 J](https://tex.z-dn.net/?f=%20E_%7B2%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dmv_%7B2%7D%5E%7B2%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dm%282v_%7B1%7D%29%5E%7B2%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dm%5B4%28%5Cfrac%7B8%7D%7Bm%7D%29%5D%20%3D%2016%20J%20)
Therefore, the kinetic energy is 4 times the initial value.
I hope it helps you!
It is the smallest planet with a bluish color that can probably make it look like a comet
<span>Answer:
Correct answer is
just add the two kinetic energies;
E = (1/2)mv^2 + (1/2)mv^2</span>
