Answer:
2,800 n
Explanation:
hope this helps, have a nice day/night! :D
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Answer:
I think C
Explanation:
Since the bus is moving away from John.
{C - V}.
Answer:
External force on him will be 112 N
Explanation:
We have given the mass of the sprinter m =70 kg
Acceleration of the sprinter 
We have to find the net external force
According to second law of motion force = mass ×acceleration
Force is dependent on the mass and acceleration
So 
So external force will be 112 N