Physics: a car is moving at 56 miles per hour the kinetic energy of that car is how much energy does that same car have when it moves at

a car is moving at 56 miles per hour the kinetic

Ответ:

jaylasmith884

22.07.2021

Complete Question

A car is moving at 56 miles per hour. The kinetic energy of that car is 5 × 105 J. How much energy does the same car have when it moves at 90 miles per hour? Answer in units of J

K.E_2=640000J

Explanation:

From the question we are told that:

Initial Velocity v_1=56 mil/h=25.0342m/s

K.E_1=5*10^5J

Final Velocity V_2=90mil/h=40.2336m/s

Generally the equation for Kinetic Energy is mathematically given by

K.E=0.5mv^2

Therefore

K.E_1=0.5mv_1^2

5*10^5J=m(25.0342)^2

m=797.82kg

Therefore The Final K.E_2 is

K.E_2=0.5mv_2^2

K.E_2=0.5*(797.82kg)(40.2336m/s)^2

K.E_2=640000J

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a car is moving at 56 miles per hour the kinetic energy of that car is how much energy does that same car have when it moves at

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