Question

plz answer with explain​

Answer 1

Answer:

45J

Explanation:

Initial kinetic energy of the system = $K_{i}$ = KE of 1kg mass + KE of 9kg mass

                                                                  = $\frac{1}{2} mv^{2}-0$

                                                                  = $0.5*1*100$

                                                                  = 50 J.

After the collision, applying the conservation of the linear momentum:

$1*10+9*0=(1+9)*v$    [v is the final velocity of the whole system.]

=> v = 1m/s.

Therefore, final KE of the system = $K_{f}$ = $1/2 m v^2$

                                                                = $0.5*10*1$   = 5 j

Therefore, KE converted into heat energy = $K_{f}-K_{i}$

                                                                       = -45 J

Here, -ve sing indicates that energy is lost by the system.