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.#

#14625"kg.m/s"#

#2.#

#40125"kg.m/s"#

#3#.

#(a)#

#-585"N"#

#(b)#

#-1605"N"#

#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.