An object is acted upon by a constant force which gives it a constant acceleration a. at a certain time t1, having started from rest at t = 0, it has kinetic energy k1. at what time t2 has its kinetic energy doubled?

Explanation:

The kinetic energy of a body is that energy it possesses due to its motion. In classical mechanics, this energy depends only on its mass and speed, as follows:

The speed in an uniformly accelerated motion is given by:

Replacing this expression in the formula for the kinetic energy, we have:

So, if we have :

Equaling (1) and (2) and solving for :

a straight line sloped

the components of a vector are the parts of the vectors that are to each other.

b perpendicular