Your teacher must be a fan of Harry Porter!
The cart had a mass of 8,000 kg and it was accelerating at a rate of 4 m/s2.
Using the formula Force = mass * acceleration
Net force on the cart = 8000*4
= 32000 Newton
F=m∙a
m, mass = 8,000 kg
a, accelerating rate = 4 m/s2
F=8000*4
=32000 kg m/s2
=32000 N
hope u dont mind my double-dipping!
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