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skad [1K]
3 years ago
7

A racecar driver accelerates many times during a race. If a driver accelerates from 70m/s to 100m/s in 1.5 seconds before making

a turn, what is the acceleration on the driver?
A. 30ms2
B. −30ms2
C.  20ms2
D. −20ms2
Physics
1 answer:
raketka [301]3 years ago
3 0
A=(vf-v₀)/t

Data:
vf=100 m/s
v₀=70 m/s
t=1.5 s

a=(100 m/s - 70 m/s)/1.5 s=30 m/s / 1.5 s=20 m/s².

answer:  C. 20 m/s²
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3.body

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3 years ago
A car starts from rest and after 10 seconds is traveling at 20 m/s. Assuming that it continues to accelerate at the same rate it
Alenkinab [10]

Assuming that it continues to accelerate at the same rate it will take another 10 seconds to reach 40 m/s.

Answer:

Explanation:

Since the first question states that there is a change in the velocity from rest to 20 m/s in 10 seconds time interval. So the acceleration experienced by the car during this 10 seconds should be determined first as follows:

Acceleration = (final velocity-initial velocity)/Time

Acceleration = (20-0)/10 = 2 m/s².

So this means the car is traveling with an acceleration of 2 m/s².

As it is stated that the car continues to move with same acceleration, then in the second case, the acceleration is fixed as 2 m/s², initial velocity as 20 m/s and final velocity as 40 m/s. So the time taken for the car to reach this velocity with the constant acceleration value will be as follows:

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5 0
4 years ago
5. A store clerk moved a 4.4-kg box of soap without acceleration along a shelf by pushing it with a horizontal force of magnitud
lesantik [10]

The box moved 0.73 m

<u>Explanation:</u>

Given data,

Magnitude 8.1 N Work on the box 5.9 J Clerk move a 4.4 Kg

Distance= work done on the box / Horizontal force on the magnitude

              = 5.9/8.1

               =0.728

Distance =0.73 m

The box moved 0.73 m

5 0
3 years ago
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