class iv ds lesson 7 exercise

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Equation of motion by graph

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MOTION Equations of motion by graphical method We already know about equations of motion when an object moves along straight line with uniform acceleration. We already know how to derive them but these equations can also be derived by graphical method. a. Equation for velocity time relation Consider the velocity-time graph of an object that moves under uniform acceleration as shown below in the figure 7. From this graph, you can see that initial velocity of the object is  u u  (at point A) and then it increases to  v v  (at point B) in time  t t . The velocity changes at a uniform rate  a a . Again from figure it is clear that time  t t  is represented by OC , initial velocity  u u  by OA and final velocity of object after time  t t  by BC. From graph as given in figure 7 it is clear that  B C = B D + D C = B D + O A B C = B D + D C = B D + O A . So we have  v=BD+u     ...
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class 3 s.st lesson 2 something to do

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                      CLASS – 3    S.St Lesson -2   QUESTION - ANSWER D – ANSWER THE FOLLOWING QUESTIONS- Que 1 – List three ways in which the family members can resemble one another. Ans 1- Family members can resemble each other in colour of the skin, shape of the nose, forehead, walking, and talking   etc. Que2 – In what ways are you similar to your family members? Ans 2- My voice is similar to my mother. Que 3 – What confusion can be created if the twins are identical? Ans 3- Sometimes even the parents of the identical twins find it difficult to tell who is who! Que 4 – Do you want to follow the occupation of your parents? Why? Ans 4- Yes, because my father is an ideal for me. Que 5 – How do family members share their joys together? Explain with an example. Ans 5- The members of a family may live together or far away, ...
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