Two identical pellet guns are fired simultaneously from the edge ofa cliff. These guns impart an initial speed of 38 m/s to eachpellet. Gun A is fired straight upward, with the pellet going upand then falling back down, eventually hitting the ground beneaththe cliff. Gun B is fired straight downward. In the absence of airresistance, how long after pellet B hits the ground does pellet Ahit the ground? (in sec)
I started by labeling knowns and unknowns:
VoA= 38 m/s
accelA= -9.8 m/s^2 (gravity)
timeA=?
VoB = -38 m/s
accelB=-9.8 m/s^2
timeB=?
Then wrote my equations of motion:
VA = VoA + accelA(timeA)
VB = VoB + accelB(timeB)
Is it safe to assume both VA and VB (velocities of A and Brespectively) are = 0?
(Since both pebbles hit the ground at this instant, their velocityis 0?)
Either way, I'm stuck trying to solve... Someone help please!
Two identical pellet guns are fired simultaneously from the edge ofa cliff. These guns impart an initial speed of 38 m/s to eachpellet. Gun A is fired straight upward, with the pellet going upand then falling back down, eventually hitting the ground beneaththe cliff. Gun B is fired straight downward. In the absence of airresistance, how long after pellet B hits the ground does pellet Ahit the ground? (in sec)
I started by labeling knowns and unknowns:
VoA= 38 m/s
accelA= -9.8 m/s^2 (gravity)
timeA=?
VoB = -38 m/s
accelB=-9.8 m/s^2
timeB=?
Then wrote my equations of motion:
VA = VoA + accelA(timeA)
VB = VoB + accelB(timeB)
Is it safe to assume both VA and VB (velocities of A and Brespectively) are = 0?
(Since both pebbles hit the ground at this instant, their velocityis 0?)
Either way, I'm stuck trying to solve... Someone help please!
