Percentage loss of kinetic energy, or new speed after a loss

1. A.
   $19.0{\text{ }ms}^{- 1}$
2. B.
   $4.47{\text{ }ms}^{- 1}$
3. C.
   $14.41{\text{ }ms}^{- 1}$
4. D.
   $1.00{\text{ }ms}^{- 1}$

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1. A.
   $32\%$
2. B.
   $44\%$
3. C.
   $16\%$
4. D.
   $84\%$

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