A rocket sled with initial mass of 3 metric tons, including 1 ton of fuel, rests on a level section of track. At \(t=0\), the solid fuel of the rocket is ignited and the rocket burns fuel at the rate of \(75 \mathrm{~kg} / \mathrm{s}\). The exit speed of the exhaust gas relative to the rocket is \(2500 \mathrm{~m} / \mathrm{s}\), and the pressure is atmospheric. Neglecting friction and air resistance, calculate the acceleration and speed of the sled at \(t=10 \mathrm{~s}\).