(8%) Problem 7: Two children pull a third child backwards on a snow-saucer sled exerting forces Fy = 13.5 Nand Fp = 7.5 N, as shown in the figure. Note that the direction of the friction force, f=5.7 N, is unspecified: it will be opposite in direction to the sum of the other two forces. F./' 4 / \". / - . N , i N theexpertta.com \\. S $ 50% Part (a) Find the magnitude, in meters per squared second, of the acceleration of the 47 kg sled and child system. a=0.3900 m/s> X Incorrect! & 50% Part (b) Let east be towards the right of the sketch, and let north be towards the top of the sketch. Assuming the sled starts at rest, find the direction of the velocity in degrees north of east. Grade Summary f=|l Deductions Potential 100% Submissions Attempts remaining: | (50% per attempt) detailed view sin() tan() cosh() cotanh() @Degrees O Radians