A body of mass 10kg is moving with a velocity (6i +8j) at a certain instant. it's K.E will be. A) 250J B) 500J C)100 J D) 1000J ...?
1 Answer
May 24, 2018
B) 500J
Explanation:
For 2D motion:
In our case:
Now
This can be seen using Pythagoras on a triangle with hypotenuse
&
so substituting for
->
->
So plugging into a calculator (or using mental math):