F=M×A
F=3 ×15
F=45N
so the force is 45 N
Answer:
0
Explanation:
The displacement is zero since it goes in a full circle and ends up where it started.
Speed = Distance/ Time
Speed = 400 / 4
Speed = 100 km/hr.
100 km per hour.
What is an example of how you can use scientific inquiry to solve a real life problem.
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