31. Just before hitting the earth, the kinetic energy of an object of mass 2 kg is 400 J. At which height it was dropped?
32. When an object move 1m distance by 1N force on the direction of force then work done will-
33. A gun of mass 5 kg fires a bullet of mass 0.01 kg. If the initial velocity of bullet is 250 m/s then find the recoil velocity of gun.
34. Mechanical energy is a combination of kinetic energy and-
35. As an object falls freely its . . . . . . . .
36. Calculate the potential energy obtained by a 20kg hammer, when it is raised to a height of 10m?
37. A mobile was dropped from a balcony if the mass of the mobile phone is 0.5kg and the mobile phone was dropped from a height of 100m, g = 10m/s2. So what is the potential energy of mobile phone?
38. Efficiency of work is known as-
39. A horizontal force of 10 N displaces an object of 5 kg to a distance of 2 m in the direction of the force. What will be the work done by the object?
40. If the speed of a moving object is doubled . . . . . . . .
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