588.399 newtons. (60 * 9.80665)
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60 kilograms = 132.28 pounds.
Force = mass * accelerationForce = (15 kg)(4 m/s2)= 60 Newtons===========( about 60 times the force needed to push in a doorbell button )
About 50 to 60 Lbs
i think that a 9 yr. old should weigh 60-90 pounds i weigh 85 pounds and i am 9
they should at least be 30-60