Answer:
speed 9/speed 4 = 2sqrt3 / 3
Explanation:
KE = 1/2 m v^2
for 9 kg = 3 * the 4 kg 1/2 (9)va^2 = 3* 1/2 (4) vb^2
va^2 / vb^2 = 3* 1/2 (4) / (1/2 *9)
6 / 4.5
va / vb = sqrt (6/4.5) = 2sqrt3 /3
ratio of the 9 speed to the speed of the 4 is 2 sqrt 3 /3
