A positively charged particle initially at rest on the ground accelerates upward to (100 mathrm{~m} / mathrm{s})

Question:

A positively charged particle initially at rest on the ground accelerates upward to $100 \mathrm{~m} / \mathrm{s}$ in $2.00 \mathrm{~s}$. If the particle has a charge-to-mass ratio of $0.100 \mathrm{C} / \mathrm{kg}$ and the electric field in this region is constant and uniform, what are the magnitude and direction of the electric field?

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