Physics

Problem

A rocket of mass

4.0\times10^{3}\,\text{kg}

is launched vertically. The engines provide an upward thrust of

65\,\text{kN}

, while air resistance (drag) exerts a

5.0\,\text{kN}

force downward. Neglecting any change in mass, determine the rocket’s acceleration at this instant. (Take upward as the positive direction.) a)

+0.52\,\text{m/s}^{2}

-5.2\,\text{m/s}^{2}

+5.2\,\text{m/s}^{2}

+6.4\,\text{m/s}^{2}