As the picture shows, ski jumping is a sport for the brave. It was carried out by using a specially built platform on the mountain. Athletes step on special skis without poles.

(1) According to the meaning of the question, athletes do flat throwing in the air.

If you do a vertical free fall, there are: Lsinθ= 12gt2 1…①.

If you do uniform linear motion in the horizontal direction, there are: Lcosθ=v0t 1…②.

According to ①, t 1=Lg=40 10s=2s, so the photographer should press the shutter for a long time after the athlete takes off to capture the moment when the athlete lands at point B. 。

From ②: v0 = lcos θ t1= 40× 322m/s =103m/s.

(2) When the athlete's speed is parallel to the slope, it is the highest when viewed from the snow, including:

v0 tanθ= vy；

And vy = gt2；;

T2 = v0tan θ g =103× 3310s =1s can be obtained.

That is, the photographer can only press the shutter 1s after the athlete takes off, so as to capture the moment when the athlete is far away from the highest place in the snow.

A:

(1) The photographer should press the shutter for 2 seconds after the athlete takes off to capture the moment when the athlete lands at point B. 。

(2) The photographer can only capture the moment when the athlete leaves the highest place in the snow by pressing the shutter 1s after the athlete takes off.