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What would be the force required to stop...

What would be the force required to stop a car of mass 1000 kg. and a loaded truck of mass 10,000 kg in 2 s. if they were moving with same velocity of 5 m/s ?

Text Solution

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Mass of car `m_1=1000kg`
Mass of truck, `m_2=10000kg`
Velocity of car and truck (y) = 5 m/s
Time = 2 seconds
momentum of car before stpping = `m_1v`
`=1000xx5`
`=5000kgm//s`
Momentum of the car after stopping = 0
Let force required to stop the car = F
`therefore" "F="change in momentum"/"time"`
or `F=(5000-0)/2`
or F = 2500 N
Let force required to stop the truck = F.
`therefore" "F.="change in momentum"/"time"`
`=(1000xx5)/2=25000N`
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