Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 2 - Force and Laws of Motion

Question 88 Exercise

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 2000kg?

a) A balloon filled with air and its mouth untied/is released with its mouth in the downward direction, it moves upwards because of the air that is present in the balloon rushes out in the downward direction. This is the equal and opposite reaction in the downward direction as the air pushes the balloon upwards.

b) Mass of the unloaded truck, m1 = 2000 kg

Acceleration, a1 = 0.5 m/s2

Mass of loaded truck, m2 = 2000 + 2000 = 4000 kg

Acceleration, a2 = ?

m1×a1 = m2×a2

a2 = 0.25 \mathrm{m/s^2}

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