IF AJP opens floor 5 days continuously. How much it rest?

The boom of a fire truck raises a fireman (and his equipment—total weight 290lbf) 30ft into the air to fight a building fire. (a) Using unity conversion ratios, calculate the work done by the

Q: Drop a mass of 2 kg from a height of 10 m. If 20% of the energy of the mass converts into sound when it hits the ground, how much is the sound energy Ans: Ep=20/100*2*10*10 =40 J