Take a picture of a flat ball by stroboscopic photography. The cameras are exposed at equal intervals. When taking pictures,

1, the direction of gravity acceleration should be vertical downward.

2. Find the initial speed and exposure time interval. The method is as follows:

Measure the vertical distance from the last first ball to the last ball, and get the height of the first ball and the horizontal distance from the last ball to the first ball. According to the height of the first ball and the acceleration g of gravity, the falling time of the ball from the first position to the fourth position is obtained. This time divided by the number of images is the interval of flashing lights.

Initial velocity, the average velocity is obtained by using the falling time just obtained and the measured horizontal distance, which is the initial velocity of flat throwing.

The premise is that flat throwing belongs to horizontal uniform motion and vertical accelerated motion.

Photography major mentioned physical problems. You should give me more points. Ha ha.