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Grade: 11
        
the velocity v of a body moving along a straight line varies with time t as v= 2t2e-t , where v is in m/s and t in sec. The acceleration of body is 0 at t=
1)0
2)2
3)3
4)both (1) and (2)
5 years ago

Answers : (2)

bharat bajaj
IIT Delhi
askIITians Faculty
122 Points
							v= 2t2e-t .....
a = dv/dt = 2. ( -t^2. e^(-t) + e^(-t).2t) = 2.t.e^(-t) ( 2 - t) .....
Hence, a = 0 at t = 0 and t = 2 s....Option 4) is correct....THanks..Bharat Bajaj...IIT Delhi
askiitians faculty
5 years ago
Arun Kumar
IIT Delhi
askIITians Faculty
256 Points
							

Hello
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty
5 years ago
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