148704 A force acts on a $30 \mathrm{~g}$ particle in such a way that the position of the particle as a function of time is given by $x=\alpha t^{2}$, where $x$ is in metre, $t$ is in seconds and $\alpha=1 \mathrm{~m} / \mathrm{s}^{2}$. The work done during the first $4 \mathrm{~s}$ is
148704 A force acts on a $30 \mathrm{~g}$ particle in such a way that the position of the particle as a function of time is given by $x=\alpha t^{2}$, where $x$ is in metre, $t$ is in seconds and $\alpha=1 \mathrm{~m} / \mathrm{s}^{2}$. The work done during the first $4 \mathrm{~s}$ is
148704 A force acts on a $30 \mathrm{~g}$ particle in such a way that the position of the particle as a function of time is given by $x=\alpha t^{2}$, where $x$ is in metre, $t$ is in seconds and $\alpha=1 \mathrm{~m} / \mathrm{s}^{2}$. The work done during the first $4 \mathrm{~s}$ is
148704 A force acts on a $30 \mathrm{~g}$ particle in such a way that the position of the particle as a function of time is given by $x=\alpha t^{2}$, where $x$ is in metre, $t$ is in seconds and $\alpha=1 \mathrm{~m} / \mathrm{s}^{2}$. The work done during the first $4 \mathrm{~s}$ is
148704 A force acts on a $30 \mathrm{~g}$ particle in such a way that the position of the particle as a function of time is given by $x=\alpha t^{2}$, where $x$ is in metre, $t$ is in seconds and $\alpha=1 \mathrm{~m} / \mathrm{s}^{2}$. The work done during the first $4 \mathrm{~s}$ is