The inexperienced driver of an all-wheel-drive car applies too much throttle as he attempts to accelerate from

Question:

The inexperienced driver of an all-wheel-drive car applies too much throttle as he attempts to accelerate from rest up the slippery 10-percent incline. The result is wheel spin at all four tires, each of which has the same gripping ability. Determine the vehicle acceleration for the conditions of (a) light snow, μ_k = 0.12 and (b) ice, μ_k = 0.05.123