Related questions with answers

What is the name of the law that says that the total momentum before a collision or explosion is equal to the total momentum after collision or explosion?

A block of mass $m$ , after sliding down a frictionless incline, strikes another block of mass $M$ that is attached to a spring of spring constant $k$ (see below). The blocks stick together upon impact and travel together. (a) Find the compression of the spring in terms of $m, M, h, g$ , and $k$ when the combination comes to rest. Hint: The speed of the combined blocks $m+M\left(v_2\right)$ is based on the speed of block $m$ just prior to the collision with the block $M\left(\mathrm{v}_1\right)$ based on the equation $v_2=(m / m)+M\left(v_1\right)$ . This will be discussed further in the chapter on Linear Momentum and Collisions. (b) The loss of kinetic energy as a result of the bonding of the two masses upon impact is stored in the so-called binding energy of the two masses. Calculate the binding energy.

In the balloon diagram above, why don't the two forces cancel each other out? A They are not equal. B They both act on the air. C They both act on the balloon. D They act on different objects.