5. how much force is required to accelerate a 12kg mass at 5m/s? ?

Therefore the force required to accelerate 12 kg mass at 5 m/s²  is 60N

Explanation:

How much force is required to accelerate a 12kg mass at 5m/s?

Using newton's law of motion;

F = mass × acceleration

mass is given to be 12 kilogram and acceleration is given to be 5 meter per square second.

So we will substitute the value into our equation;

F = mass × acceleration

   =12 kg  ×  5 m/s²

   = 60 kg m/s

F =  60 kg m/s²

But kg m/s²= N

The unit for measuring force is N

F =  60 N

Therefore the force required to accelerate 12 kg mass at 5 m/s²  is 60N

i don,t know so just answer mine

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3. c) iron and nickel.