Weight/Newtons/unknown method

[themadperseid]

Here is the question

To lift a patient, four nurses grip the sheet on which the patient is lying and lift upward. If each nurse exerts an upward force of 240n, and the patient has an upward acceleration of .504 m/s^2, what is the patients weight.

answer: 913 N

HOW DOES THIS WORK. THANKS

 

[moose]

weird, I keep getting 638N

Are you sure this answer you provided is correct?

 

[zwtipp05]

I get 913 N as the weight as well.

960 N=W+m*.540 m/s^2
960 N= m(g+.54)
m=93.08 kg
W=mg=913 N

 

[themadperseid]

riru, just in case u missed that,
knowns
960n force up
.504 m/s^2 acceleration

n=kg*m/s^2
960n=?kg*(.504+9.8)---->to accelerate upwards, the force is the upward velocity, plus gravity, since that is being overcome.

thus, you have 93.2kg patient (mass)
w=mg
so 93.2kg*9.8m/s^2=913n