81. A boy hold 4 kg school bag for 30 seconds, the work done by him will be in joule.
82. When a bullet is fired from a gun, its potential energy is converted into?
83. A compressed spring has . . . . . . . . energy compared to a normal spring.
84. Which of the following energy increases with speed?
85. The work done by a force is equal to the
86. By which the kinetic energy of an object increases-
87. Linear momentum is equal to . . . . . . . .
88. When a constant force acts on an object with a mass of 8 kg for a period of 3 seconds, it increases the velocity of the object from 4 ms-1 to 6 ms-1. What is the gravity of the force used?
89. By the turbines flowing water and air are used for change in . . . . . . . .?
90. The mass density of an object is defined as its . . . . . . . .
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