# physics- drbob can u plz help me???

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1. What force is needed to give a mass of 25 kg an acceleration of 20m/s squared?

2. A force of 6N acts upon a 2-kg mass. What is the acceleration of the masS?

3. It takes a force of 50N to give a body an acceleration of 10m/s squared. What is the mass of the body?

4. a) what is the weight of a 10-kg piece of iron?

b) what is the mass of an object that weighs 490N?

Hi Nicola-

I am not a physicist; however, I believe you can work all of your problems, as DrWLS suggested, with F=ma.

• physics- drbob can u plz help me??? -

since force is equal to mass × acceleration now question one answer is 25×20=500

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