1: Because it can be regarded as uniform linear motion with initial velocity of 0, 1/2at? =H gives a= 1.2, so f = ma = 72nv = at =1.2m/s.

2:a=F/M= 12m/s？

This time, the movement process is to accelerate evenly first, then decelerate to 0, and the displacement is exactly 0.6.

You are a mobile phone user, and the number of words cannot exceed 100.