College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 102

According to Newton's laws of motion (which will be studied in Chapter 4), a frictionless 30° incline should provide an acceleration of 4.90 m/s 2 down the incline. A student with a stopwatch finds that an object, starting from rest, slides down a 15.00-m very smooth incline in exactly 3.00 s. Is the incline frictionless