posted by Anonymous .
A 3.00kg block starts from rest at the top of a 30.0 degree incline and accerlates uniformly down the incline moving 2.00 m in 1.50 s. find the magnitude of the accerlation of the block
The distance = (1/2)*(acceleration)*(time)^2 + (initial velocity)*(time)
They have provided more information than you need to answer the question. That is to done to give you practice in knowing what to use and what to ignore.
The average speed is 2/1.5 = 4/3 m/s. The final speed is twice that, or 8/3 m/s
The acceleration is the final speed divided by the time
a = (8/3)/(3/2) = 16/9 = 1.78 m/s^2