एक गेंद को h ऊंचाई से जमीन पर गिराया जाता है। यदि प्रत्यावस्थान गुणांक (coefficient of restitution) e है, तो गेंद के उछलना बंद करने में लगने वाला कुल समय किसके समानुपाती होता है?

Which of the following forces is/are responsible for the sedimentation of particles during centrifugation?

Which of the following forces always opposes the applied motion or force?

Statement: An object of mass M falls freely under gravity, maintaining a constant acceleration. Conclusion I: The velocity of the object increases uniformly with time. Conclusion II: The acceleration of the object depends on its mass. Choose the correct option: