Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.MiscellaneousEasy2 minPYQ_2020

PhysicsEasynumerical

The displacement of an object of mass $3 kg$ is given by the relation $S = \frac{1}{3} t^{2}$ , where $t$ is time in seconds. If the work done by the net force on the object in $2 s$ is $\frac{p}{q} joule$ , where $p$ and $q$ are smallest integer values, then what is the value of $p + q$ ?

Answer:

11.00

Solution:

$S = \frac{t^{2}}{3}$

$v = \frac{d S}{d t}$

$\frac{d S}{d t} = \frac{2}{3} t = v;$

$W = ∆ K = K_{t = 2} - K_{t=0}$

$W= \frac{1}{2} m (v_{t = 2}^{2} - v_{t = 0}^{2}) = \frac{1}{2} \cdot 3 (\frac{16}{9} - 0) = 8 / 3 J$

$\Rightarrow p + q = 11$

Subject:PhysicsTopic:W.E.P.Subtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

Doubts & Discussion

Loading discussions...