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Levart [38]
3 years ago
13

Truck covers 40 m in 8.5 seconds slowing to a final speed of 2.8 m/s find original speed

Mathematics
1 answer:
sergejj [24]3 years ago
7 0
V = u + at
2.8 = u + a*8.5
2.8 = u + 8.5a

s = ut + 0.5at^2
40 = u*8.5 + 0.5*a*8.5^2
40 = 8.5u + 36.125a

(2.8 = u + 8.5a) * 8.5
23.8 = 8.5u + 72.25a

Subtract those equations
16.2 = - 36.125a
a = 0.448

2.8 = u + (8.5*-0.448)
2.8 = u - 3.8
u = 6.6 m/s

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Alenkasestr [34]

Answer:

x = 12

Step-by-step explanation:

x - 5 = 84/x

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Answer:

If you use 3.14 as an approximation for PI, the answer will be A) 179 sq. feet.

Step-by-step explanation:

The process to determine the area of the sidewalk is computed by figuring the area of the outer circle (Diameter = 16' + 3' + 3') and subtracting the area of the fountain (Diameter = 16') from that.

Area of Circle = PI times Radius squared

Outer circle radius = (22 ft /2) = 11 ft

Area of outer circle (includes fountain area too) = 3.14 x 11 x 11 = 379.94 ~ 380

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Area of sidewalk =  380 - 201 =  179

Read more on Brainly.com - brainly.com/question/11852368#readmore

4 0
3 years ago
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Gnoma [55]
First get rid of the exponent: 6x + 3 = 243. then subtract 3 from both sides: 6x = 240. lastly divide both side by 6: x = 40. be sure to check your work by plugging it back in.
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Sauron [17]

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