NEET 2016
- Exam
- NEET
- Year
- 2016
- Subject
- Physics
- Chapter
- Work, Power and Energy
NEET 2016 · Physics · Work, Power and Energy
A body of mass 1kg begins to move from rest under the action of a...
A body of mass begins to move from rest under the action of a time dependent force \overset{\to}{F} = \left(2t\overset{^}{i} + 3{t}^{2}\overset{^}{j}\right)N, where \overset{^}{i}and \overset{^}{j} are unit vectors along x and y axis. What power will be developed by the force at the time t?
Options
- A
- B
- C
- D
Correct answer
D.
Step-by-step solution
\overset{\to}{a} = 2t\overset{^}{i} + 3{t}^{2}\overset{^}{j}
\overset{\to}{\text{V}} = \dfrac{{2t}^{2}}{2} \overset{^}{i} + \dfrac{3}{3} {t}^{3} \overset{^}{j}
\overset{\to}{F} = 2t\overset{^}{i} + 3{t}^{2}\overset{^}{j}