Question

A stationary 400kg cannon fires a 10kg ball North at 30m/s. Calculate the velocity of the cannon.

a. 2m/s South

b. 0.75m/s South

c. 0.5 m/s North

d. 30m/s South

Answer 1

Explanation:

According to the conservative of momentum,

MV + mv = MV¹+ mv¹

0 + 0 = 400 x V¹ + 10 x 30

V¹ = - 300/400 = - 0.75 m/s

direction opposite to the ball that is due south.