## Related questions with answers

If A $2.0 \mathrm{~kg}$ puck is moving east at $5.5 \mathrm{~m} / \mathrm{s}$. It catches up to and collides with a second identical puck moving due east at $3.0 \mathrm{~m} / \mathrm{s}$. The collision is perfectly inelastic.

a. What is the resulting velocity of the pucks?

b. What is the initial kinetic energy $E_{k i}$ of the system?

c. What is the change in kinetic energy, $\Delta E_k$, of the system as a result of the collision?

d. If the mass $m$ is doubled, but the initial velocities are unchanged, does the resulting velocity increase, decrease, or remain unchanged?

Solution

Verified**Given:**

$m_1=m_2=m=2$ kg $v_1=5.5\,\frac{\text{m}}{\text{s}}$ $v_2=3.0\,\frac{\text{m}}{\text{s}}$

In this problem we will calculate the final velocity pucks, the initial amount of energy, the change in the kinetic energy of the system, if the mass m is doubled with the same initial velocity whether the final velocity decreases or increases.

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