You pull a box with a constant force across a frictionless table using an attached to
tionless table using an attached rope held horizontally. if
you then pull the box with the same force but now at an angle to the horizontal (the box
now at an angle to the horizontal (the box remains flat on the
table), does the acceleration of the box:
a. remain the same
b. increase
c. decrease
d. there is no acceleration
e. the angle needs to be known

i know that answer is c but can someone explain why you

Explanation:

From Newton's second law, the net force equals the mass times acceleration.

∑F = ma

The acceleration of the box is caused by the horizontal component of the force.  Applying Newton's law in the x direction:

F cos θ = ma

When the rope is horizontal, θ = 0, so cos θ = 1.

As θ increases, cos θ decreases.  So the acceleration decreases.

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.