Asked by carol
a rubber ball is thrown against a horizontal wall and bounces back with the same speed it came in at. The change in momentum vector of the ball is
A) 10 m/s^2
B) in the same directions the ball's initial motion
C) in the opposite direction as the ball's initial motion
D) zero
A) 10 m/s^2
B) in the same directions the ball's initial motion
C) in the opposite direction as the ball's initial motion
D) zero
Answers
Answered by
Damon
The units of A) are acceleration, m/s^2 , not momentum which is mass * velocity so NO WAY
If it reversed direction of velocity without changing sign of momentum
then
obviously it came back with NEGATIVE MASS !
so NO WAY
C) well all right
D ) LOL, it was thrown at zero speed ? Perhaps the mass was zero?
If it reversed direction of velocity without changing sign of momentum
then
obviously it came back with NEGATIVE MASS !
so NO WAY
C) well all right
D ) LOL, it was thrown at zero speed ? Perhaps the mass was zero?
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