**(a)**

In the y-direction:

N = mg + Fsin25°

In the x-direction:

Fcos 25° = μ_{s}N

Substitute for N in the equation in the x-direction.

A contestant in a winter sporting event pushes a 45.0-kg block of ice across a frozen lake as shown in the figure. Gine the coefficient of static friction to be μ_{s }= 0.1, and the coefficient of kinetic friction to be μ_{k}_{ }= 0.03

(a) Calculate the minimum force F he must exert to get the block moving.

(b) What is the magnitude of its acceleration once it starts to move if that force is maintained?