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Which are those two vectors whose resultant vector is zero?
They are vectors of equal magnitudes in oppositedirections. When you add them, they cancel out each other.
How much does a Newton weigh - pounds?
A newton is not a measure of weight, it is a measure of force. It is the force required to accelerate a mass of one kilogram at the the rate of 1 meter per second each second. (1 N = 1 kg.m/s2) A newton of force (in the downwards direction) at Earth's surface is numerically similar (but a bit smaller) than the mass of the object times 10 since the acceleration due to gravity is 9.80665 m/s2 at that location. In the Imperial system the equivalent unit is pound force, again this is not a weight. 1 pound-force is equivalent to 32.17 lb(mass).ft/s2.
What is the variables of throwing?
wind and its direction amount of force applied may differ each throw aiming skills
How do you find the resultant if the vector is parallel to each other?
Just by adding
Statement of polygon law of forces?
if several COPLANAR FORCES are acting at a point simultaneously such that each one of them can be represented in direction and magnitude by a side of a polygon, taken in order, then the resultant is given by the closing side in the reverse order
