I see you're in Middle School, so I've got a hunch that they want you
to say "the dresser because it has more mass". But that's a poor
answer, to a poor question.
The fact is that there's no way to tell.
The force it takes to move either object across the floor does NOT really
depend on just its mass. It depends on both the object's mass AND the
friction between the object and the floor. And THAT depends on the shape
of the feet where they touch the floor, and what kind of material the feet and
the floor are made of.
So it seems to me that we really don't have enough information to answer
the question with.
But again, I suspect that the answer they want is "the dresser because
it has more mass".
Answer:
-4.33m/s
Explanation:
Using the law of conservation of momentum
m1u1+m2u2 = (m1+m2)v
m1 and m2 are the masses
u1 and u2 are their respective velocities
v is the final velocity
From the question;
m1 = 4000kg
m2 = 6000kg
u1 = 4m/s
u2 = ?
v =-1m/s
Substitute into the formula and get u2
4000(4)+6000u2 = (4000+6000)(-1)
16000 + 6000u2 = -10000
6000u2 = -10000-16000
6000u2 = -26000
6u2 = -26
u2 = -26/6
u2 = -13/3
u2 = -4.33m/s
Hence the velocity of the truck is -4.33m/s
