When certain a force is applied to a 2kg standard mass, its acceleration is 5m/s^2.When the same force is applied to another object its aceleration is 2m/s^2. The mas of the objects is:

Answer 1

From the first bit of information, the force is
F = m a = 10 Newtons

For the second object, using the same force, the slower acceleration tells you that the mass M must be

M = F/a = 10/2 = 5 kg