It decreases because it gave its momentum to the other car.
Answer:
Explanation:
the sphere is solid and conducting, so the charge is uniformly distributed over its volume.
Answer:

Explanation:
Let the distance moved by Joe is "d"
so the time taken by him to drove it by speed 45 mph is given as


now the same distance is traveled by him with speed 55 mph
so the time taken by him

so total time taken by him for complete distance 2d



now the average speed is given as



100 millimeters equals 0.1 meters.