Answer: It should be the 3rd option down!
Explanation:
F=ma
Therefore the net force = 1000kg × 2 metres per second per second
So F=2000 N
Answer:
The momentum would be doubled
Explanation:
The magnitude of the momentum of the freight train is given by:
where
m is the mass of the train
v is its speed
In this problem, we have that the speed of the train is unchanged, while the mass of the train is doubled:
therefore, the new momentum is
so, the momentum has also doubled.
Momentum (p) = mass × velocity
P= 200,000×4.5
P= 900,000 .... answer !!
The change in velocity is +4 m/s to the right (or -4 m/s to the left).
The object's mass is irrelevant.