KE = 1/2mv²
= 1/2(100)(4.0²)
KE = 800 J
hope this helps :)
To develop this problem it is necessary to apply the equations concerning the conservation of the moment.
By definition the moment can be expressed in two ways,
The first as a function of force and because of time, that is
And also based on mass and speed
Speed 1 is moving in the opposite direction to our reference system and it remains constant, as is the mass therefore
Equation both expression we have that,
Therefore the speed of the glider is 2m/s
We only need to look at Newton's 2nd law of motion:
Net force = (mass) x (acceleration)
If the net force on an object is zero, then either its mass or its acceleration must be zero. If it's called an "object", then its mass isn't zero, so its acceleration is zero.