When skiing in Emei Mountain, a tourist started to slide down a slope with an inclination of 37 from a standstill. A photographer shows it to tourists with a camera with an exposure time of 0.2s.

(1) S represents the displacement in the problem, θ represents the inclination angle of the slope, △t represents the exposure time, μ represents the dynamic friction coefficient between the snowboard and the slope, and m represents the mass of the skier. Let the downhill acceleration of the skier be a and the speed in the middle of contact be v0.

There is v02=2as.

v0=L△t

We can get: a=5.0m/s2.

(2) According to Newton's second law, mgsinθ-μmgcosθ=ma.

Dynamic friction coefficient μ = 0. 1.25.

A: (1) The average acceleration of tourists is 5.0m/s2. ..

(2) The dynamic friction coefficient between the snowboard and the ramp is 0. 1.25.