ok i have to translate this...
a boy stands on a scale and it shows 30 kg. The boy bends his knees and jumps off the scale. His friend see that the highest weight was 40 kg. What is the higest acceleration rate the boy gets in his jump?
2007-02-28 00:23:49 · 4 answers · asked by appelstina 1 in Science & Mathematics ➔ Physics
i know the correct answer is 3,3..just wondered why. thanks
2007-02-28 01:32:13 · update #1
The frist answer is correct. His highest and only acceleration (neglecting air resistance) can only be the value of gravity. You seem to be using the terms Mass and weight interchangeably. This is not so. Mass - the amount of matter an object contains, or a measurement of its inertia - is measured in kg. While weight is a force measured in N. F=ma. Our weight is a result of our acceleration due to gravity.
2007-02-28 00:59:56 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The scale feels a force due to acceleration of 10 kgf or ~100 N.
a = F/m = 100 N / 30 kg = 3.3 m/s^2
2007-02-28 00:31:41 · answer #2 · answered by gebobs 6 · 0⤊ 0⤋
THE WEIGHT SHOWS 40 KG AS HE APPLIES A FORCE ON THE SCALE IN ORDER TO GET UP IN ACCORDANCE TO NEWTON'S SECOND LAW OF MOTION.THE FORCE APPLIED BY HIM IS OF 10 Kgf OR 100 N.THERE FORE HIS ACCELERATION WOULD BE 100/30 m/s2
ACCERATION=0.3333333333 m/s2
2007-02-28 00:29:48 · answer #3 · answered by satwik 2 · 0⤊ 0⤋
10 m / s^2.
2007-02-28 00:29:39 · answer #4 · answered by Anonymous · 0⤊ 0⤋