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
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b. mass 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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