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

تمرين 38

A car initially at rest experiences loss of its parking brake and rolls down a straight hill with a constant acceleration of 0.850 m/s 2 , traveling a total of 100 m. Let's designate the first half of the distance as phase 1 with a subscript of 1 for those quantities, and the second half as phase 2 with a subscript of 2. (a) The car's speeds at the end of each phase should be related by which condition (1)
(2)
, or (3)
(b) Now calculate the two speeds and compare them quantitatively.