PART A)
momentum of Bill's car
mass = 900 kg
speed = 3.5 m/s towards west
so momentum of this car given as

Similarly momentum of Tanya's car
mass = 1100 kg
speed = 2 m/s towards East
so momentum will be

Total momentum of both cars will be
Towards west
PART B)
Since there is no external force on the system of two cars
So here total momentum of both cars will remains conserved
So final momentum of two cars will be same as initial momentum
towards west
Part C)
final momentum of Bills car
Towards East
now we have


towards west
Answer:
681.6/ms
Explanation:
A reconnaissance plane flies 545 km away from its base at 568 m/s. then flies back to its base at 852 m/s.
What is its average speed?
Answer in its of m/s
Avg speed of the round trip is
2*568*852/(568+852)= 681.6/ms
C. when the circuit is closed
Answer: reaction force = -558N
Explanation:
w = f = 558N
since action force and reaction force are equal in magnitude and opposite in direction,
reaction force = -(f)
reaction force = -558N
if that helps.