TPR Physics Question

[Perseverance7779311]

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Hi guys. The question reads, Find the force that must be provided to lift a 49-N object with an acceleration of 9.8 m/s2.


The answer says,
F-mg=ma
F=ma +mg
=m(a+g)
=49/9.8(9.8 +9.8)
=98N

Im confused as I don't know what...I am lost at the part when they start dividing 49/9.8. Please help me. Thank you.

 

[Cawolf]

F = m(a + g) = (5 kg)(9.8 N/kg + 9.8 N/kg) = (5 kg)(19.6 N/kg) = 98 N

What they are doing is getting "m" when they are dividing; because the mass = force due to gravity/acceleration from gravity.

Also the Q&A sub-forum is better for these questions.

 

[Perseverance7779311]

@Cawolf Yea, I was looking in the Q&A subforum, wondering why i couldn't find my question and then i realized that i may have posted it in the wrong forum, and yep i did. Thank you so much because i was so confused!!!!