Calculate (in N) the force a mother must exert to hold her 12.0 kg child in an elevator under the following condition:
The elevator accelerates upward at 1.57 m/s^2m/s2 .
The mass of the child is given by 12.0Kg i.e 
The elevator acceleration upward at 1.57m/s^2 i.e
The acceleration due to gravity is given by 
The normal force on the floor of the elevator is given by

the weight of the child is

Therefore the force a mother must exert to hold her child is 136.44N.
Calculate (in N) the force a mother must exert to hold her 12.0 kg child in...
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