Q. A car is moving down a street at 65 km/h. A child suddenly runs into the street. If it takes the driver 0.76 s to react and apply the brakes, how many meters will the car have moved before it begins to slow down?
Q. A slide projector needs to create a 95 cm high image of a 2.0 cm tall slide. The screen is 340 cm from the slide. Assume that it is a thin lens.
(a) What focal length does the lens need?
(b) How far should you place the lens from the slide?