Question

M=8кг;Fтрения=2%Fтяж.;s=20м;A(работа)=?Дж

Answer 1

F= 8кг×2%×20м=320H/кг

Answer 2

To calculate the work done against friction, we need to first find the force of friction, which is equal to 2% of the weight of the object:

F_friction = 2% * M * g

where g is the acceleration due to gravity, which is approximately 9.81 m/s^2.

F_friction = 0.02 * 8 kg * 9.81 m/s^2 = 1.57 N

The work done against friction can now be calculated as:

A = F_friction * s

A = 1.57 N * 20 m = 31.4 J

Therefore, the work done against friction is 31.4 joules.