This is a physics problem.
The law is that the momentum is preserved: total momentum before collsion = total momentum after collision
Momentum before collision = 80 kg.m/s - 100 kg.m/s = -20 kg.m/s
Then answer is b. - 20 kg.m/s
When two lines intersect to form a 90 degree angle, these lines are called perpendicular lines.
Answer:c
Step-by-step explanation:
Step-by-step explanation: