An electron which is moving with a velocity of $5 \times 10^6 {m} / {sec}$ emerges from a sheet of paper of thickness $2.1 \times 10^{-4} {~cm}$. with a velocity of $2 \times 10^6 {~m} / {sec}$.

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An electron which is moving with a velocity of $5 \times 10^6 {m} / {sec}$ emerges from a sheet of paper of thickness $2.1 \times 10^{-4} {~cm}$. with a velocity of $2 \times 10^6 {~m} / {sec}$.

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