Figure here shows the frictional force versus displacement for a particle in motion. The loss of kinetic energy in travelling over $s = 0$ to $20\, m$ will be......$J$
$250$
$200$
$150$
$10$
A $1000\,\, kg$ elevator rises from rest in the basement to the fourth floor, a distance of $20\,\, m$. As it passes the fourth floor its speed is $4\,m/sec$. There is a constant frictional force of $500\, N$. The work done by the lifting mechanism is
By what reasons chemical energy produced in chemical process ?
The position $x$ of a particle moving along $x$-axis at time $(t)$ is given by the equation $t=\sqrt{x}+2$, where $x$ is in metres and $t$ in seconds. the work done by the force in first four seconds is .............. $J$
State the importance of work energy theorem. Whether the work energy theorem is a scalar or a vector ?
A ball is released from a height of $10\, m$. If after the impact there is loss of $40\%$ in its energy, the ball shall rise upto- ................. $\mathrm{m}$