$\begin {array} {1 1} (1)\;2.7 \times 10^{-21}ms^{-1} & \quad (2)\;2.7 \times 10^{-18}ms^{-1} \\ (3)\;9 \times 10^{-2}ms^{-1} & \quad (4)\;3 \times 10^{-31}ms^{-1} \end {array}$

(mass of electron $ = 9.1 \times 10^{-31} kg)$

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$\begin {array} {1 1} (1)\;2.7 \times 10^{-21}ms^{-1} & \quad (2)\;2.7 \times 10^{-18}ms^{-1} \\ (3)\;9 \times 10^{-2}ms^{-1} & \quad (4)\;3 \times 10^{-31}ms^{-1} \end {array}$

(mass of electron $ = 9.1 \times 10^{-31} kg)$

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