Consider a small rocket that is launched from the ground, initially at rest at t = 0 s. After 8.0 s have elapsed, it is 610 m above the ground and is moving upwards (the +y direction) at a speed of 18.0 m/s. Assume that the rocket moves up in a straight line, and neglect air resistance. If the rocket engine shuts off at t = 8.0 s (when it is 610 m above the ground, and is moving upwards at a speed of 18.0 m/s) and undergoes free fall, what velocity does it strike the ground?
A. –111 m/s.
B. –109 m/s.
C. –96 m/s.
D. –60 m/s.
Answer:A
Consider a small rocket that is launched from the ground, initially at rest at t = 0 s. After 8.0 s have elapsed, it is 610 m above the ground and is moving upwards (the +y direction) at a speed of 18.0 m/s. Assume that the rocket moves up in a straight line, and neglect air resistance. If the rocket engine shuts off at t = 8.0 s (when it is 610 m above the ground, and is moving upwards at a speed of 18.0 m/s) and undergoes free fall, what velocity does it strike the ground?
A. –111 m/s. B. –109 m/s. C. –96 m/s. D. –60 m/s.