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Gre4nikov [31]
3 years ago
15

A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final speed of 2.80 m/s. (a) find its original speed. (b) find

its acceleration.
Physics
2 answers:
liberstina [14]3 years ago
4 0
Speed equation: speed = total distance/total time

speed = 40.0m / 8.50s

speed = 4.71 m/s

acceleration equation: acceleration = change in velocity/time

4.71 - 2.80 = 1.91 (change in velocity)

acceleration = 1.91/8.50

acceleration = .22 m/s^2

a) 4.71 m/s
b) .22 m/s^2
attashe74 [19]3 years ago
4 0

<u>Answer:</u>

<u>For a:</u> The original speed of the truck is 4.76 m/s

<u>For b:</u> The acceleration of the truck is -0.23m/s^2

<u>Explanation:</u>

  • <u>For a:</u>

Speed is defined as the rate at which an object moves with respect to time.

To calculate the time taken for the given speed, we use the equation:

s=\frac{d}{t}

where,

s = speed of the truck

d = distance traveled = 40.0 m

t = time taken by truck = 8.50 s

Putting values in above equation, we get:

s=\frac{40.0m}{8.50s}=4.76m/s

Hence, the original speed of the truck is 4.76 m/s

  • <u>For 2:</u>

Acceleration is defined as the rate of change of velocity with respect to time.

Mathematically,

a=\frac{v-u}{t}

where,

v = final velocity  of the truck = 2.80 m/s

u = initial velocity  of the truck = 4.76 m/s

t = time taken  = 8.50 s

Putting values in above equation, we get:

a=\frac{2.80-4.76}{8.50}=-0.23m/s^2

Negative sign represents slowing down or deceleration.

Hence, the acceleration of the truck is -0.23m/s^2

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