PLEASE ANSWER Q. 7.
Force is applied on an object of mass 2 Kg at rest on a frictionless horizontal surface as shown in the graph. The speed of the object at t=1 s will be 



(1) 7.5 m/s (2)  12.5 m/s
(3) 10 m/s  (4) 25 m/s

ans option 3 
impulse= ft = mv
​for t =1s ,f = 20N
​so speed = 10m/s 
 
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