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dimaraw [331]
3 years ago
10

An automobile accelerates from rest at 2.0 m/s2 for 20 s. The speed is then held constant for 20 s, after which there is an ac-

celeration of -3.0 m/s? until the automobile stops. What is the total distance traveled?
Physics
1 answer:
MaRussiya [10]3 years ago
5 0

Answer:

1446.7m

Explanation:

You need to look at this in 3 separate stages, and then sum thedistance from each stage:

Stage 1)

a=2

t=20

V_0=0

s=V_0t+\frac{1}{2}g t^2

x=400m

We also need to find the final velocity v=a*t=20*2=40m/s

Stage 2)

a=0

v=40

t=20

x=vt

x=800m

Stage 3)

a=-3

v_0\\=40

v=0

v^=v_0^2 + 2 a x\\0=40^2+2*(-3)x\\x=266.7m

So the total distance is x=400+800+266.7=1466.7m

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3 years ago
A hockey puck is hit on a frozen lake and starts moving with a speed of 13.60 m/s. Exactly 6.2 s later, its speed is 7.20 m/s. (
stellarik [79]

Answer:

-1.03 m/s²

Explanation:

Acceleration: This can be defined as the rate of change of velocity. The S. I unit of acceleration is m/s².

Mathematically, acceleration is expressed as

a = (v-u)/t ........................ Equation 1

Where a = acceleration, v = final velocity, u = initial velocity, t  = time.

Given: u = 13.60 m/s, v = 7.20 m/s t = 6.2 s.

Substituting into equation 2

a = (7.20-13.60)/6.2

a = -6.4/6.2

a = -1.03 m/s²

Note: a is negative because, the hockey puck is decelerating.

Hence the average acceleration = -1.03 m/s²

3 0
3 years ago
A car is stopped at a red light. When the light turns green, the car accelerates until it reaches a final velocity of 45 m/s. It
tigry1 [53]

Answer:

270 m

Explanation:

We can find the distance travelled by the car by using the following suvat equation:

s=(\frac{u+v}{2})t

where

s is the distance travelled

u is the initial velocity

v is the final velocity

t is the time

For the car in this problem,

u = 0

v = 45 m/s

t = 12 s

Substituting into the equation, we find:

s=(\frac{0+45}{2})(12)=270 m

8 0
3 years ago
A 20-kilogram mass is traveling with a velocity of 3 m/s. What is the object's kinetic energy?
jolli1 [7]

solution

Given

mass= 20kg

velocity =3m/s

K.E=?

K.E= ½mv²

½×20×3²

½×20×9

½×180

90 J

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4 years ago
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This statement is false

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