An object moves in the eastward direction at constant speed. A net force directe
ID: 1791549 • Letter: A
Question
An object moves in the eastward direction at constant speed. A net force directed northward acts on the object for 5.0 s. At the end of the 5.0-second period, the net force drops to zero newtons. Which one of the following statements is necessarily true?
A. The direction of the object's acceleration depends on how fast the object was initially moving.
B. The magnitude of the object's acceleration depends on how fast the object was initially moving.
C. The object will be moving eastward when the force drops to zero newtons.
D. The final velocity of the object will be directed north of east.
E. The change in the velocity of the object will be directed north of west.
Explanation / Answer
The answer is B.The magnitude of the object's acceleration depends on how fast the object was initially moving.
Let, suppose for a electron on magnetic field, then force= q*(v cross B). So, force depend on v=velocity. i.e. amplitude of acceleration also depend on it.