A20-kg wagon accelerates on a horizontal surface at 0.50 m⁄s2 when pulled by a rope exerting a 120-n force on the wagon at an angle of 25° above the horizontal. determine the magnitude of the effective friction force exerted on the wagon and the effective coefficient of friction associated with this force.

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight

One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.

Look at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way