HELP Assignment due in an hours

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In summary, the conversation discusses two physics problems - one involving a gold ball being hit at an angle and the other involving a motorcycle and car at a traffic light. For the first problem, the initial speed, time in air, and height of the ball's landing point are requested. For the second problem, the time when the car is closest to the motorcycle, the instant rate of the car stopping, and the distance traveled by the motorcycle are requested. The conversation also includes equations to solve for these values.
  • #1
kara
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HELP ! Assignment due in an hours

A gold ball is hit from ground @ 25* to the horizontal. When it lands, it has a velocity of 20 m/s @ 30* below horizontal.
A) find initial speed
B) time that ball is in air
C) height of landing pt. relative to start pt, which may be positive or negative
 
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  • #3
i've got another one too..
A motorcycle is stationary at traffic light. At t=0s, light turns green and it accelerates at 3m/s2 when light turns gree, a car is 40 m behind the motorcycle and traveling at 15m/s. At that instant, car slows down at a constant rate so it is never closer than 5 m to motorcyle.
A) time when car is closest to motorcycle
B) instant rate of car stopping
C) distance traveled by motorcycle from light turning green to tim in A)
 
  • #4
RE: See above post.
 
  • #5
1/2at2 - 1/2(1.5)t2 + 15t -35.0 = 0 what do i do from there
 
  • #6
a = (3t-15.0)/t is what i got for a
Now i need to sub that into above to solve for t
 
  • #7
i suggest setting two equation one for motorcycle and one for the car then combine the two equation 1 = equation 2 and solve for T i believe.
 

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