Is this statement true or false? Northerners refused to allow blacks to join the Union army at the start of the war because they believed they could not fight.

True

Explanation:

Among the arguments put forward by those who opposed the policy were that blacks would not enlist in the first place; that they were too cowardly to fight; that arming them would unleash their “savage nature”; that they lacked the intelligence to be good soldiers...

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j