91. When the force exerted on an object, then the work done will be zero if it has displacement.
92. Mechanical energy is the sum of
93. When two equal forces are acting on a body and in the opposite direction, the force acting on the body becomes . . . . . . . .
94. A man jumped at a speed of 5 metre per second from a stationary boat and the boat moved off with the speed of 0.5 metre per second. How many times is the mass of the boat greater than that of the man?
95. The example of non-conventional sources of energy is
96. An object of mass 15kg is moving at the uniform velocity as 5m/s. Find the kinetic energy contained in an object?
97. An object of 1kg is dropped to the ground from a height of 30m. What is the work done by the force of gravity? (g = 10 m/s2)
98. A truck, a car and a motorcycle have equal kinetic energies. If equal, stopping forces are applied and they stop after travelling a distance of X, Y and Z respectively, then
99. What is the kinetic energy of the bicycle having 10kg weight moving at a speed of 20m/s?
100. Energy that is produced commercially from coal is called
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