Spaceship 1 and spaceship 2 have equal masses of 150 kg. spaceship 1 has
a speed of 0 m/s, and spaceship 2 has a speed of 6 m/s. they collide and
stick together. what is their speed?
o
a. 900 m/s
o
o
b. 3 m/s
c. o m/s
o
d. 6 m/s

B. 3 m/s

Explanation:

We can solve the problem by using the law of conservation of momentum; in fact, the total momentum before and after the collision must be conserved. So we can write:

where:

m1 = 150 kg is the mass of spaceship 1

m2 = 150 kg is the mass of spaceship 2

u1 = 0 m/s is the initial velocity of spaceship 1

u2 = 6 m/s is the initial velocity of spaceship 2

v is the velocity of the two ships after they collide and stick together

Solving for v, we find:

3. dark matter

empty space could also be a simple vacuum