Answer to Question #312767 in Mechanics | Relativity for Nam

Question

suppose a 4,400 pounds(lbs). object was traveling at a speed of 49.2ft/s. now, this mass transfer all its energy to another body with a mass of 44lbs . what Will be the velocity of the 44lbs mass after being hit by it.

Answer 1

Explanations & Calculations

• All the kinetic energy the larger object had gets transferred to the smaller object and the larger one comes to rest.
• Therefore,

$\qquad\qquad \begin{aligned} \small 0.5×4400\,lb×(49.2)^2&=\small 0.5×44\,lbs×v^2\\ \small v&=\small \sqrt{100\times(49.2)^2}\\ &=\small 10\times49.2\\ &=\small 492\,fts^{-1} \end{aligned}$