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Angelina_Jolie [31]
3 years ago
11

As you suddenly stop the vehicle, you should

Physics
1 answer:
viva [34]3 years ago
4 0
I'm guessing c because the others are pointless
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A father racing his son has half the kinetic energy of the son, who has half the mass of the father.The father speeds up by 1.0
Helga [31]

Answer:

(a) v_f=2.414\ m.s^{-1}

(b) v_s=4.828\ m.s^{-1}

Explanation:

Let:

mass of father be, m_f

mass of son be, m_s=\frac{m_f}{2}

speed of son be, v_s

initial speed of father be, v_f

After speeding up, speed of father is  v_f+1

<u>We know Kinetic Energy is given as</u>

KE=\frac{1}{2} m.v^2 .....................................(1)

where:

m = mass

v = velocity

Hence, according to the initial condition the father is having kinetic energy half the kinetic energy of the son.

KE_s=2.KE_f

\frac{1}{2} m_s.v_s^2=2\times \frac{1}{2} m_f.v_f^2

(\frac{m_f}{2})\times v_s^2=2\times m_f\times v_f^2

v_s=2v_f .................................................(2)

According to the final condition:

\frac{1}{2} m_s.v_s^2= \frac{1}{2} m_f.(v_f+1)^2

(\frac{m_f}{2})\times v_s^2=m_f.(v_f+1)^2

v_s^2=2(v_f+1)^2

v_s=\sqrt{2}(v_f+1).....................................................(3)

(a)

From eq. 2 & 3

2v_f=\sqrt{2}(v_f+1)

\sqrt{2}\ v_f=(v_f+1)

v_f(\sqrt{2}-1)=1

v_f=\frac{1}{(\sqrt{2}-1)}

v_f=2.414\ m.s^{-1}

(b)

<em>putting the above value in eq. (2)</em>

v_s=4.828\ m.s^{-1}

4 0
4 years ago
80 POINT!!!!! IT'S WORTH IT!!!!!
alexandr402 [8]

because blah blah blah blah

3 0
3 years ago
A car traveling with constant speed travels 150 km in 7200s what is the speed of the car
Oksana_A [137]
Velocity is distance/time 

so 150/7200=.0208km/s 

unless you have to convert it to miles or something else. but use the formula!
5 0
3 years ago
Please help! 30Points!! An ultrasound machine uses waves to create images. The machine uses sound waves and which wave interacti
Gnesinka [82]
The correct answer should be C
5 0
3 years ago
Read 2 more answers
I will give more points <br>for this thank you I u helped<br>me ​
scZoUnD [109]

Answer:

weight = mass×gravity

  • 15×9.8
  • 147N

<h2>stay safe healthy and happy.</h2>
6 0
3 years ago
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