Answer:
12 m/s
Explanation:
The acceleration in the first 15 m is
The velocity at the end of the first 15 m can be calculated using the following equation of motion:
where v1 velocity of the crate at the end of the 1st 15 m, 0m/s is the initial velocity when starts from rest, a = 3.646 m/s2 is the acceleration of the crate in the 1st 15m, and is the distance traveled.
As for the 2nd 15m, let's find the friction force first. Let's g = 9.81 m/s2
The net force would be 350 - 235.44 = 114.56 N
Then the net acceleration be:
114.56 / 96 = 1.19
Using the similar equation of motion above, we can calculate the final velocity