Question #06e0b

1 Answer
Dec 19, 2017

Answer:

7.5 kg

Explanation:

Friction equation:
#F_r = μN#
So we can calculate normal reaction, N:
#N = F_r/μ = 67/0.91= 73.63# N

Then since there is no acceleration in vertical direction:
#N = mg ⇒ m = N/g = 73.63/9.81= 7.5# kg