Answer:
F = 210 N
Explanation:
Given that,
Mass of a boy is 50 kg
Mass of a bicycle is 20 kg
Total mass is 70 kg
Acceleration of the total mass is 3 m/s².
We need to find total force that is being applied. Net force is given by :
F = ma
F = 70 kg × 3 m/s²
F = 210 N
So, the net force is 210 N. Hence, the correct option is (d).
