Answer:
The magnitude of the acceleration is at its maximum value.
Acceleration = 
Explanation:
During simple harmonic motions such as the oscillation of a spring, at the two extremes of the motion, the acceleration of the mass becomes maximum. This is because this is the point where the force on the body is maximum.
The angular velocity 
At points of maximum extension x, the maximum acceleration is given by the formula.

substituting in the value for
, this implies that

⇒
Answer:
687.5 A
Explanation:
We are given that

Magnetic field,B=0.11 T
Diameter,d=2.5mm
Radius,r=

We know that current in coil

Substitute the values


1. e) None of the above is necessarily true.
2.d) Without knowing the mass of the boat and the sack, we cannot tell.
In freely falling body, there is no force acting on it other than the force of gravity (g).
I believe the answer is valcanos because they release sulfur in to the air and other chemicals so it willl affect the anispher