Question

Mary is driving a car of mass 900 kilograms toward the north with a velocity of 22 meters/second. Danny is driving his

velocity of 15 meters/second toward the east. They collide and both cars move together afterwards. What is the mag
momentum of the cars after the collision?
A.
1.8 x 104 kilogram-meters/second
B.
2.0 x 104 kilogram-meters/second
C.
2.7 x 104 kilogram-meters/second
D. 2.4 x 104 kilogram-meters/second

Answer 1

d

Explanation:

Answer 2

D). 2.4
`x10^(4) (kg*m)/(s)`

Explanation:

Mary is driving toward north so the angle is 90° and Danny is driving toward the east so angle is 0°

Momentum Dary=
`900 kg* 22 (m)/(s)`

Momentum Danny=
`900 kg* 15 (m)/(s)`

So the total momentum is the magnitude:

Mag=
`\sqrt{(900 kg*22(m)/(s) )^(2)+(900kg*15(m)/(ys) )^(2)}`

mag=
`√(574290000)=23.96434852 x10^(3)`≅
`2.4 x10^(4)`