The kinetic energy of a body of mass $2 kg $ and momentum of $2 Ns$ is ............. $\mathrm{J}$
$1$
$2 $
$3$
$4 $
(a)$E = \frac{{{P^2}}}{{2m}} = \frac{{{{(2)}^2}}}{{2 \times 2}} = 1J$
A cricket ball is hit at ${30^o}$ with the horizontal with kinetic energy $K$. The kinetic energy at the highest point is
Internal forces acting within a system of particles can alter
If the momentum of a body is increased $n$ times, its kinetic energy increases
The machine as shown has $2$ rods of length $1\, m$ connected by a pivot at the top. The end of one rod is connected to the floor by a stationary pivot and the end of the other rod has a roller that rolls along the floor in a slot As the roller goes back and forth, a $2\, kg$ weight moves up and down. If the roller is moving towards right at a constant speed, the weight moves up with a
Consider a car moving on a straight road with a speed of $100\, m/s$. The distance at which car can be stopped is …….. $m.$ $[{\mu _k} = 0.5]$
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