Answer:
C. Gravitational forces only cause objects to be attracted to each
other, and magnetic and electric forces can cause objects to
attract or repel each other.
Where the m1 and m2 is the mass of two object. U1 and U2 are the initial velocity of hockey pucks. V1 and V2 are the final velocity of Hockey Pucks.
m2=2kg The initial velocity of both pucks are 0. The v1=8m/s. All you have to do now is find v2
0=4-2v
-4=-2v
v=+2m/s
Answer: +2
Answer:
-7.5 kg m/s
Explanation:
Initial momentum (p1) = 4.5 kg m/s
final momentum (p2) = -3.5 kg m/s
We have to find out the change in momentum , As linear momentum is a vector quantity. So, we have to use the vector form to solve the momentum change . Means we have to take the sign of momentum also.
Change in momentum = Final momentum - initial momentum
So,
Change in momentum = p2 - p1
Insert values from question,
Change in momentum = -3.5 kg m/s - 4 kg m/s
So, change in momentum = -7.5 kg m/s
<span>c. a hot tub full of hot water</span>
