Question

Which of the following statement is correct?
$\left(i\right)$ In the elastic collision, the final K.E. is equal to the initial K.E.
$\left(ii\right)$ In an inelastic collision, the final K.E. may be smaller or greater than the initial K.E.
$\left(iii\right)$ In every collision, momentum is conserved.
$\left(iv\right)$ In completely inelastic collision, colliding particles stick to each other and move with same velocity. There will be loss of K.E.

• A. All optiona are correct
• B. $\left(i\right),\left(iii\right),\left(iv\right)$
• C. $\left(i\right),\left(ii\right)$
• D. $\left(i\right),\left(ii\right),\left(iii\right)$

Answer 1

The correct option is A All optiona are correct

Hint: “Elastic and inelastic collision”

Formula used:

$P_i=P_f$

$\Delta K=K_f-K_i$

Solution:

Momentum always remains conserved if no external force acts on the system. If collision is elastic, energy remains conserved but in case of completely inelastic collision, energy is lost in the form of sound, heat.

Final Answer: $\left(d\right)$.