1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
NeTakaya
3 years ago
14

You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When

you increase your speed by 28%, you are running at the same speed she is. If your mass is 86 kg, what is her mass?
Physics
1 answer:
Blizzard [7]3 years ago
3 0

Answer:

52.49 Kg

Explanation:

Let m1 and v1 denote your mass and velocity respectively

Let m2 and v2 denote your friends mass and velocity respectively

Kinetic energy is given by

KE= 0.5mv^{2}  

Since your kinetic energies are the same hence

0.5m1(v1)^{2}=0.5m2(v2)^{2}

m1(v1)^{2}=m2(v2)^{2} and making m2 the subject then  

m2=\frac { m1(v1)^{2}}{(v2)^{2}}

Since v2 is v1+0.28v1=1.28v1

Substituting m1 for 86 Kg

m2=\frac { 86 Kg(v1)^{2}}{(1.28v1)^{2}}= 52.49023\approx 52.49 Kg

You might be interested in
. Prior to Remy's trip to Cleveland, his uncle tells him about this amazing barbecue restaurant there and raves about
Andrews [41]

whats the restraunt called

6 0
2 years ago
An airplane flies 1,592 miles east from Phoenix, Arizona, to Atlanta, Georgia, in 3.68 hours.
Gnoma [55]
Maybe it is around 300
8 0
3 years ago
What causes a star to shine brightly
steposvetlana [31]

what causes a star to shine brightly:

by squeezing atoms together in its core

5 0
3 years ago
Read 2 more answers
ANSWER ASAP GIVING BRAINLIEST FIVE STARS AND A HEART!
aev [14]
If the waves are sound waves, the change in frequency is heard as a change in pitch. As a sound source moves toward the listener, the waves reach the listener with a higher frequency. The pitch appears to increase because of the Doppler effect. ... It describe the quality of the sound you hear.
8 0
2 years ago
Give reason why think before you use a simple cell ?​
xxMikexx [17]
I agree with the other dude
8 0
2 years ago
Other questions:
  • How does temperature change as you go from the surface toward the center of the earth?
    8·1 answer
  • What is the total number of neutrons in an atom of an element that has a mass number of 19 and an atomic number of 9?
    11·1 answer
  • NASA decides to put a 128 kg satellite into orbit over the planet Venus because they want to take pictures. The satellite is 37,
    9·1 answer
  • What determines how the different moon phases appear from earth
    14·2 answers
  • A deuteron (a nucleus that consists of one proton and one neutron) is accelerated through a 4.01 kV potential difference. How mu
    5·1 answer
  • What is the atomic number of this element?
    14·2 answers
  • Which structure reduces friction between joints?
    7·1 answer
  • A candy-filled piñata is hung from a tree for Matthew's birthday. During an unsuccessful attempt to break the 4.4-kg piñata, Hay
    13·1 answer
  • Which phenomenon supports the particle model of light?
    10·2 answers
  • Question 9 of 10
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!