After the run, the boy begins to slide on the ice at a speed of 8 m / s and stops after 5 s.

After the run, the boy begins to slide on the ice at a speed of 8 m / s and stops after 5 s. The boy’s weight is 40 kg. What is the resultant of all the forces inhibiting the boy’s movement?

The given tasks: V (the speed with which the boy starts to slide on the ice) = 8 m / s; t (slip duration) = 5 s; m (boy’s weight) = 40 kg.
The resultant of all the forces that inhibit the boy’s movements can be determined by the formula: F = | m * a | = | m * ((V – V0) / t) |.
Calculation: F = | 40 * ((0 – 8) / 5) | = 64 N.
Answer: The boy’s movement was inhibited by the resultant force of 64 N.