Ameter stick a hurtles through space at a speed v = 0.25c relative to you, with its length aligned with the direction of motion. you stand on earth and have another meter stick b with its length aligned with the direction of motion of meter stick a. you measure the length of meter stick a to be 1 m. what is the length of meter stick b, l_b, as seen in the rest frame of meter stick a?

Explanation:

Given:

Since the object is moving with a velocity comparable to the velocity of light  with respect to the observer therefore the length will appear shorter according to the theory of relativity.

Mathematical expression of the theory of relativity for length contraction:

where:

L = relativistic length

original length at rest

Lorentz factor

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s