Assume a car and truck are moving with the Impulse same speed of 15 m/s. 1) Calculate momentum of the car of mass 975 kg 2) Calculate momentum of the truck of mass 2675 kg 3) Determine the force =? Needed to stop each in 25 s.

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Answer 1 · 2015-11-10T00:50:22

$1 .$ $1.$

$14625 kg.m/s$ $14625"kg.m/s"$

$2 .$ $2.$

$40125 kg.m/s$ $40125"kg.m/s"$

$3$ $3$ .

$(a)$ $(a)$

$- 585 N$ $-585"N"$

$(b)$ $(b)$

$- 1605 N$ $-1605"N"$

$1 .$ $1.$

Momentum = mass x velocity

$:.M_1=975xx15=14625"kg.m/s"$

$2.$

$:.M_2=2675xx15=40125"kg.m/s"$

$3.$

The acceleration is the change in velocity/time.

$a=(0-15)/25$

Force = mass x acceleration.

So for the 1st truck:

$F_1=975xx(-(15)/(25))=-585"N"$

So for the 2nd truck:

$F_2=2675xx(-(15)/(25))=-1605"N"$

The minus sign means this is a braking force.