(C) The power delivered to the particle is constant,$P = 0.5 \ W$. Since the initial speed is zero,the initial kinetic energy is $0 \ J$. The work don

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(C) The power delivered to the particle is constant,$P = 0.5 \ W$. Since the initial speed is zero,the initial kinetic energy is $0 \ J$. The work done by the force in time $t = 5 \ s$ is equal to the change in kinetic energy. Work done $W = P \times t = 0.5 \ W \times 5 \ s = 2.5 \ J$. Using the work-energy theorem,$W = \Delta K = \frac{1}{2}mv^2 - 0$. $2.5 \ J = \frac{1}{2} \times 0.2 \ kg \times v^2$. $2.5 = 0.1 \times v^2$. $v^2 = 25$. $v = 5 \ m/s$.

Class 11 Physics Work, Energy, Power and Collision Power

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$A$ particle of mass $0.2 \ kg$ is moving in one dimension under a force that delivers a constant power $0.5 \ W$ to the particle. If the initial speed of the particle is zero,the speed (in $m/s$) after $5 \ s$ is:

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$1$
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$3$
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$5$
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$7$

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$A$ particle of mass $0.2 \ kg$ is moving in one dimension under a force that delivers a constant power $0.5 \ W$ to the particle. If the initial speed of the particle is zero,the speed (in $m/s$) after $5 \ s$ is:

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$A$ car of mass $2000 \ kg$ is lifted by a crane through a distance of $30 \ m$ in $1 \ minute$. $A$ second crane does the same in $2 \ minutes$. The power supplied by each crane is respectively:

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