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Ответ:
acceleration = 0.12 m/s^2
Explanation:
Using Second Law of Motion,
F = m*a
F is net force (N) m is mass of the box (kg) a is acceleration of the box (m/s^2)μ = f/Fn
μ is coefficient of friction f is the friction force (N) Fn is the nomal force acting on the object (N)Fn = m*g – 90*sin(30)
Fn = (20)*(9.81) – 90*sin(30)
Fn = 151.2 N
f = μ*Fn
f = (0.5)*(151.2)
f = 75.6 N
F = 90cos(30) – 75.6
F = 2.34 N
a = F/m
a = 2.34/20
a = 0.12 m/s^2