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Questions  

A body of mass 2 kg moves along x-axis under the influence of a force which varies with time according to the graph shown in figure. Then average acceleration of the body is

 

 

a
3  m/s2
b
12.4  m/s2
c
8.33  m/s2
d
6.2  m/s2

detailed solution

Correct option is C

(3)mv - mu = Area under F - t graph.∴   2v−u= 20 × 4+12  ×  6−4  ×  20⇒   v−u=50 m/s∴    Average  acceleration  a¯=v−ut=506  m/s2=8.33   m/s2

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Statement I : The familiar equation mg = R for a body on a table is true only if the body is in equilibrium.

Statement II : The equality of mg and R has no connection with the third law.


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