Start Free Mock LoginAlready registered? Login here

Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.MiscellaneousEasy2 minQB

PhysicsEasysingle choice

A bullet of mass $50 g$ is fired with a speed $100 m / s$ on a plywood and emerges with $40 m / s$ . The percentage loss of kinetic energy is :

Options:

Answer:

Solution:

$K_{i} K_{f} % loss = \frac{1}{2} m (100)^{2} = \frac{1}{2} m (40)^{2} = \frac{∣ K _{f} - K _{i} ∣}{K _{i}} \times 100 = \frac{\frac{1}{2} m ( 40 ) ^{2} - \frac{1}{2} m ( 100 ) ^{2}}{\frac{1}{2} m ( 100 ) ^{2}} \times 100 = \frac{∣1600 - 100 \times 100∣}{100} = 84%$

Stream:JEESubject:PhysicsTopic:W.E.P.Subtopic:Miscellaneous

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...