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.
- 1.4 m/s
- 2.8 m/s
- 17 m/s
- none
The correct answer is: 2.8 m/s
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before collision 
after collision 
FIGURE 4 I this collision, the second cart bounces off the first cart.
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