A2L Item 142

Goal: Reasoning with forces and kinematics

Source: UMPERG-ctqpe60 variant

Two
blocks, M2 = M1 but of different sizes, having the
same speed, move from a frictionless surface onto a surface having
friction coefficient μk.

Which stops in the shorter time?

  1. M1
  2. M2
  3. Both stop in the same time
  4. Cannot be determined

Commentary:

Answer

(3) Both blocks will experience the same acceleration. If they
have the same initial velocity, they will stop in the same time.