Law of conservation of momentum is applicable to isolated system (no external force is applied), In this case, the change in velocity is due to the gravitational force of earth.
Question
Suppose a ball of mass m is thrown vertically upwards with an initial speed v, its speed decreases continuously till it becomes zero. Therefore, the ball begins to fall downward and attain the speed v again before striking the ground. It implies that the magnitude of initial and final momenta of the ball are same. Yet, it is not an example of conservation of momentum. Explain why.
WhatsApp
💡 Some Related Questions
The velocity-time graph of an object of mass m = 120 50 g is shown in figure. Observe the graph carefully and answer the following questions. (a) Calculate the force on the object in time interval 0 to 3 s. (b) Calculate the force on the object in the time interval 6 to 10 s. (c) Is there any time interval in which no force acts on the object? Justify your answer.
Open Answer » Two balls of the same size of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer.
Open Answer »