A car travels at a speed of 70 miles/hr relevant to the ground. (You will need to convert this unit to m/s.)

(a) What is the speed of light emitted by the car's headlight relevant to the ground?

(b) If this car is 5 m long at rest, what is its current length to the ground?

(c) If this car weights 2,000 kg at rest, what is its current mass?

(d) One hour after the departure of the car, how long did it pass to the people in the car?

(e) Can we ignore the relativistic effect? Why?