During a vertical ground test, a rocket engine exerts a downward force of 2.5×103N on the launch pad, represented by Fengine→pad=−2.5×103k^N (negative k^ is downward).
a. (a) Determine the force exerted by the launch pad on the engine.
b. (b) Add the two forces vectorially and show that the net force on the engine–pad system is zero.