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. An object of 5 kg is acted upon by two forces, 70 N each in opposite
directions . What is its acceleration?

Since two forces of 70N each are acting on a mass of 5Kg. These two forces are equal in magnitude but opposite in direction, therefore they cancel out each other. So the object of 5Kg move with acceleration.Therefore either the object is at rest or moves with uniform speed.

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Constant accelereation 
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F = m × a 
where F is the force, m is the mass and a is the acceleration. 
Given,
F = 70 N
m = 5 kg 
Substituting the values we get:
70N = 5 kg × a 
a= 70/5 = 14 m/s2
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F = m × a 
where F is the force, m is the mass and a is the acceleration. 
Given,
F = 70 N
m = 5 kg 
Substituting the values we get:
70N = 5 kg × a 
a= 70/5 = 14 m/s2
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