Physics question please!?

Question

A crate with a mass of 150 kg is placed on soft ground that sinks under the weight of the box at 0.5 m/s2. How much force is the box exerting on the ground? (g = 10 m/s2).

Really need help with this one as well. Greatly appreciated!

A force of 10 N applied to a block of ice with a mass of 10 kg moves it over a factory floor with a constant speed. What is the coefficient of kinetic friction between the block and the floor? (g = 10 m/s2).

Answer 1

Gravity is normally 9.8 m/s/s but assuming 10 m/s^2

the force would be 150 kg x 10 m/s^2 = 1500 newtons (force)

when there is no change in velocity forces must balance

  

force = mass x coeffecient of friction x gravity

10 newtons = 10 kg x 10 m/s^2 x coeffecient of friction

10 = 100 cof

CoF = .1