Question

An 8 kg ball is fired horizontally from a 1x10^3 kg cannon initially at rest. After having been fired, the momentum of the ball is 2.4x10^3 kgm/s east. Calculate the magnitude of the cannon's velocity after the ball is fired

Answer 1

initial momentum=final momentum
0(since both are at rest )= momentum of ball + momentum of cannon.

Answer 2

is momentum a vector?

Answer 3

momentum is a product of mass(scalar quantity) and velocity (vector) so it is a vector since the product of scalar and a vector is always a vector.

Answer 4

okay good i got -2.4m/s which would make sense because the cannon would go the opposite way

Answer 5

yes, exactly, the cannon will move in the opposite direction, you might have noticed that in movies :)

Answer 6

:P