1. A bottle rocket of 5 kg is set skyward and launched so that it has an acceleration of 10.5 m/s / s upwards from rest for 1.0 s before rising upwards as a projectile without any upward thrust . The upward direction has been declared positive. Determine the vertical net force acting on the rocket.

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.