Answer:
Maximum height: 20.4 m, height at 30 s: -274 m
Explanation:
If you want to find the height of the ball after 30 seconds, we must use the equation:
where
u = 20 m/s is the initial velocity
a = g = -9.8 m/s^2 is the acceleration of gravity
t is the time
Substituting t = 30 s,
This means that the ball is 274 m below its original level.
If you want to find the maximum height, then it can be find by using the law of conservation of energy: in fact, at the maximum height, all the initial kinetic energy has been converted into potential energy, so
And solving for h, we find the maximum height:
Answer:
Answer: A
Explanation:
Why?? Two objects meaning they have the same force pair must remain the same
<h2>
SOLUTION OF EACH CASES ARE GIVEN BELOW.</h2>
Explanation:
We know magnetic field due to a charge q moving with a velocity v .
Case A:
r=0.5i
Putting value of r, q and v .
We get,
Case B:
r=0.5 j
B=0
Case C:
We get,
Case D:
We get , .
Learn more:
Magnetism
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