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A car is moving horizontally along a straight line with a uniform velocity of \( 25 \mathrm{~m} \mathrm{~s}^{-1} \). A projectile is to be fired from this car in such a way that it will return to it after it has moved \( 100 \mathrm{~m} \). The speed of the projection must be
(1) \( 10 \mathrm{~m} \mathrm{~s}^{-1} \)
(2) \( 20 \mathrm{~ms}^{-1} \)
(3) \( 15 \mathrm{~ms}^{-1} \)
(4) \( 25 \mathrm{~m} \mathrm{~s}^{-1} \)
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