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Homework help, please! Urgent
This is the question from my physics 11 class, it has completely stumped me, i have done about have the question, i just get stuck when it comes to proving that the persone has or has not caught the bus.
here it is:
A personne walking at a speed of 1.7m/s see's a stopped bus 25m from him. At this moment this person starts to run with an acceleration of 1,3m/s2. After 4 secondes this personne has reached his maximum speed et it stays constant, but at the same time the bus starts moving and accelerates 2,6m/s2.
Does this person suceed in catching the bus? If so, at what time and at what distance, if not what was the smallest distance between the person and the bus.
- I am sorry if there any mistakes, i translated from french.
Ive got this so far:
Alright well, by using the initiale speed of 1,7m/s and 4s, i found his constante speed of 6.9m/s. So after that i used the acceleration and his speed to determine the distance he travelled, 17,2m. i subtracted 17,2m from 25m, which left 7,8m between the bus and the person. Then I am stuck, how do i incorporate both speeds in one equations to see if he caught the bus or not?
Update, i tryed using a time of 8s for both the peron and the bus, and i see that the bus is goin faster then the person and has traveled a dreater distance, the only problem is don't know what has happened between 4s and 8s, I am completely lost
This is the question from my physics 11 class, it has completely stumped me, i have done about have the question, i just get stuck when it comes to proving that the persone has or has not caught the bus.
here it is:
A personne walking at a speed of 1.7m/s see's a stopped bus 25m from him. At this moment this person starts to run with an acceleration of 1,3m/s2. After 4 secondes this personne has reached his maximum speed et it stays constant, but at the same time the bus starts moving and accelerates 2,6m/s2.
Does this person suceed in catching the bus? If so, at what time and at what distance, if not what was the smallest distance between the person and the bus.
- I am sorry if there any mistakes, i translated from french.
Ive got this so far:
Alright well, by using the initiale speed of 1,7m/s and 4s, i found his constante speed of 6.9m/s. So after that i used the acceleration and his speed to determine the distance he travelled, 17,2m. i subtracted 17,2m from 25m, which left 7,8m between the bus and the person. Then I am stuck, how do i incorporate both speeds in one equations to see if he caught the bus or not?
Update, i tryed using a time of 8s for both the peron and the bus, and i see that the bus is goin faster then the person and has traveled a dreater distance, the only problem is don't know what has happened between 4s and 8s, I am completely lost
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