激光主动照明的雷达方程，照明光源的辐射功率(W)，辐射距离(m)(一般值是1000m)。-Active laser radar equation lighting, illumination of the radiated power (W), radiation from the (m) (normal value is 1000m).

The objective is to find out the time at which the rocket reaches a speed of 1000m/s (3600km/hr). Analysis We know the following: * Initial mass of the rocket and fuel, 160000kg, or 160 metric tons. * Fuel combustion exhaust velocity relative