1. As a spacecraft approaches a planet, the rocket engines on it are fired (turned on) to slow it down so it will go into orbit around the planet. The spacecraft's mass is 1,775 kg and the thrust (force) of the rocket engines is 545 N.If its speed must be decreased by 1,259 m/s,how long(in minutes)must the engines be fired? (Ignore the change in the mass as the fuel is burned.)

2.As a baseball is being caught, its speed goes from45to0 m/sin about0.004s.Its mass is0.145 kg.(Take the direction the baseball is thrown to be positive.)

(a) What is the baseball's acceleration in m/s²? (Indicate the direction with the sign of your answer.)

What is the baseball's acceleration ing's? (Indicate the direction with the sign of your answer.)

(b) What is the size of the force acting on it?