science
Grade-11
Easy

Question

A supermarket trolley loaded with shopping has a mass of 60kg. It rolls across the floor at 4 m s–1 and collides with an empty trolley of mass 25kg, which was stationary. They become fastened together and roll on as one. Calculate the magnitude of the velocity of the two trolleys when locked together.

  1. 1.4 m/s
  2. 2.8 m/s
  3. 17 m/s
  4. none

The correct answer is: 2.8 m/s

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