A test vehicle designed for impact studies has a mass $m=1\mathrm{.}48Mg$ and is accelerated from rest by the impingement of a high$-$velocity

water jet upon its curved deflector attached to the rear of the vehicle. The jet of fresh water is produced by the air$-$operated piston

and issues from the $129-$mm$-$diameter nozzle with a velocity $v=147\frac{m}{s}.$ Frictional resistance of the vehicle, treated as a particle,

amounts to $12\mathrm{.}0$ percent of its weight. Determine the velocity $u$ of the vehicle $5\mathrm{.}0$ seconds after release from rest.

Answer: $u=$

$\frac{m}{s}$