Question

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Answer 1

Answer:

Area under the force time graph gives us impulse,

which is F×T or mv-mu. EQ 1

Impulse after 2 seconds is 0.5×10×2=10N/s

10 = mv-mu from EQ 1

mu=0,as body starts from rest

Given,v =7m/s

therefore m =10/7

after 3.4 seconds,impulse=0.5×3.4×15.4 which is26.18 N/s

dividing by mass,we get26.18/1.42