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acceleration c/o physical science

2.  if you are using a hammer to  hit a stake into the ground why will the acceleration of the hammer be less than the acceleration of the stake?
 
a.  force of the hammer is greater than the force of the stake
b.  the mass of the hammer is greater than the mass of the stake
c.  the mass of the stake is greater than the mass of the hammer
d.  none of these
 
I think a is the answer
 
 
 
1.  if the force of the hammer is 10 N and the mass of the stake is 5 kg, what will be the acceleration of the stake?
 
a.  there is no acceleation of since the force of the stake and hammer are equal
b.  2 m/s^2
c.  1/2 m/s^2
d.  none of these
 
thanks
 
 
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2 Answers

The hammer would have a smaller acceleration than the stake because it  (hammer) has a larger mass.
The answer to the second question is not all that clear. If the force exerted by the hammer on the stake 5 kg stake is 10 N, then you might be tempted to think that
acceleration = F/m = 10 N/5 kg = 2 m/s/s.
That is true if the 10 N were the only force acting on the stake. If another such as friction (practical situation) were to be considered, then the net force would not be 10 N, and the acceleration cannot be determined without knowing the magnitude of the force of friction.
To question 1 the answer is b. because the formula F=m*a; F=10N, m=5kg so a=2 m/sec^2
Question 2 i would say that is d because I am missing data