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Question 40: (a) If a balloon filled with air and its mouth untied/ is released with its mouth in the downward direction, it moves upwards. Why ? (b) An unloaded truck weighing 2000 kg has a maximum acceleration of 0.5 m/s2. What is the maximum acceleration when it is carrying a load of 2000 kg ? Lakhmir Singh Physics Class 9

Answer»

of unloaded truck=2000kg acceleration=0.5m/s2 FORCE= mass × acceleration F=2000kg×0.5m/s2 F= 1000N mass of LOADED truck =2000kg TOTAL mass=(2000+2000)KG =4000kg acceleration=? Force=m×a a=f/m =1000/4000 =0.25m/s2



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