70-10/70 x 100 percentage change ....
60/70, 6/7 fract change
FORCE-physical power or strength possessed by a living being:
He used all his force in opening the window.
MOTION-the action or process of moving or of changing place or position; movement.
The velocity of the particle is given by the derivative of the position vector:

(a) The particle is moving in the <em>x</em>-direction when the <em>y</em>-component of velocity is zero:

But we want <em>t</em> > 0, so this never happens, unless 2<em>c</em> = <em>d</em> is given, in which case the <em>y</em>-component is always zero.
(b) Similarly, the particle moves in the <em>y</em>-direction when the <em>x</em>-component vanishes:

We drop the zero solution, and we're left with

In the case of 2<em>c</em> = d, this times reduces to <em>t</em> = <em>c</em>/(6<em>c</em>) = 1/6.
Yes an object in motion has kinetic energy
Characteristics of refraction: When light travels from one medium to another, the frequency of light does not change. However, the velocity and wavelength change. When travelling from one optical medium to another with different refractive indices, a ray of light bends.
(Hope this helps!!)