Cars a and b are racing each other along the same straight road in the following manner: car a has a head start and is a distance da beyond the starting line at t=0. the starting line is at x=0. car a travels at a constant speed va. car b starts at the starting line but has a better engine than car a, and thus car b travels at a constant speed vb, which is greater than va

how long after car b started the race will car b catch up with car a?

Explanation:

Given

car A had a head start of

and it starts at x=0 and t=0

Car B has to travel a distance of

where is the distance travel by car A in time t

distance travel by car A is

For car B with  speed

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it will be pushed away from the source of the electric field. a negative charge in a cloud induces a positive charge in the ground below the cloud.

explanation: