Plz anyone explain!!!
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Correct answer is option D
The motorcyclist has mass and velocity. And, the force (mass x acceleration) he is about to expereince is due to the enormous acceleration (∆v/∆t) he will have to endure.
ΣF = ma
ΣF = m (∆v/∆t) acceleration = change in velocity / change in time
ΣF∆t = ∆mv = Impulse
Time is directly proportionate to impulse, but you have to draw the logical conclusion that impulse, like energy, is a constant in this equation and CAN NOT change. Impulse is defined as change in momentum and his momentum is going to change to zero with or without the helmet. Therefore, impulse can only remain constant if a change in the time of impact is accompanied by a proportional, but opposite change in the acting force.
The motorcyclist has mass and velocity. And, the force (mass x acceleration) he is about to expereince is due to the enormous acceleration (∆v/∆t) he will have to endure.
ΣF = ma
ΣF = m (∆v/∆t) acceleration = change in velocity / change in time
ΣF∆t = ∆mv = Impulse
Time is directly proportionate to impulse, but you have to draw the logical conclusion that impulse, like energy, is a constant in this equation and CAN NOT change. Impulse is defined as change in momentum and his momentum is going to change to zero with or without the helmet. Therefore, impulse can only remain constant if a change in the time of impact is accompanied by a proportional, but opposite change in the acting force.
anishkumar684:
But the answer is D in Key!
but how impule.?
hm
Ok Ok
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