Answer:

Explanation:
Given that,
If the mass of a body is 15 kg and produced an 4.2 m/s², we need to find the acceleration if the mass is 10 kg and the same force is applied.
Force is given by :
F = ma
Since force is same

So, if the mass is 10 kg, acceleration is 
Answer:
His acceleration is
Explanation:
Newton's second law states that acceleration of a body is cause by a net force, the relation between them is:

On the boy there're acting two forces, his weight (W) that points downward and the frictional force (f) that points upward (they boy moves downward and friction always is opposite to movement). So
so (1) is:

Using the positive direction downward weight and gravitational acceleration(g) are positive and friction force is negative:
, solving for a:
, weight is mg:


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