This time, Bob rides the first mile at 32 mph, and the second mile at 60 mph. Alice rides the entire two miles at the average of the two speeds. Calculate Bob's time minus Alice's time
in minutes.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

0.11 m/s and 0.28 m/s should be correct

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.