if a 65kg student exerts a force of 100 N on a 100 kg desk, The magnitude of the force that exerts on him is

By dividing you can find the answer

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

Thick and thin filaments