The correct answer is (b) kinetic energy is raised to 4 times of its initial value. Kinetic energy is given by the formula KE = (1/2) m v². If the speed (v) is doubled, then KE = (1/2) m (2v)² ...

The correct answer is (a) acceleration. Both spheres experience the same acceleration due to gravity (g = 9.8 m/s²) regardless of their mass. In free fall, acceleration is independent of mass, so both spheres fall with the same acceleration. Class ...

The correct answer is (a) does not change. Potential energy depends on height (PE = mgh) and remains unchanged if the car moves on a leveled road. Only kinetic energy changes in this case, not potential energy. Class 9th Science ...

The correct answer is (c) Remains constant. When a body falls freely towards the Earth, its potential energy decreases while its kinetic energy increases. However, the total mechanical energy (sum of kinetic and potential energy) remains constant, assuming no air ...

The correct answer is (a) the object gains energy. When mechanical work is done on an object, energy is transferred to it, increasing its kinetic or potential energy. This work-energy principle explains how forces acting on an object change its ...