Physics Homework

1. The driver of a car is initially moving at a constant
speed of 72.0 km/h when a traffic light turns red. If 0.500 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down 

2. During 5 successive 1.00 min intervals, a runner moves at the following constant speeds: 0.400 km/min, 0.240 km/min, 0.160 km/min, 0.160 km/min, and 0.320 km/min. Compute the total distance traveled and the average speed. 

3. By analyzing a multiflash photograph of a golfer hitting a golf ball, one finds that the head of the club travels 50.0 cm in 0.0100 s, just before it strikes the ball. Find the approximate instantaneous speed of the club head at the instant of contact.

4. By analyzing a multiflash photograph of a golfer hitting a golf ball, one finds that the head of the club travels 50.0 cm in 0.0100 s, just before it strikes the ball. Find the approximate instantaneous speed of the club head at the instant of contact. 

5.  Three vectors A, B, and C have the following components: Ax = 5.00, Ay = 7.00; Bx = 4.00, By = -3.00; Cx = -2.00, Cy = 5.00.
(a) Find the x and y components of A+B+ C.
(b) Find the magnitude and direction of A + B + C.