Which of the following is TRUE about moderate intensity exercise? A) An activity that gets you exercising so hard that you can only say a few words

B) An exercise intense enough to trigger lactic acid formation

C) An activity that gets you exercising and you can talk and sing easily

D) An activity that gets you exercising hard, but you are still able to talk with ease.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//