what work is said to be done in changing the velocity of from 15km/h to 30km/h if the mass of car is 1500kg
Answers
Answered by
1
this is in motion so to find to find work done we have to find kinetic enery.
kinetic energy =1/2*mass(v)2-1/2*mass(u)2
now change velocity in m/s=15*5/18=25/6
= 30*5/18=25/3
then kinetic energy =1/2*1200*(25/3)2-1/2*1200*(25/6)
now
=1/2*1200(25/3-25/6)
= 600*25/6
=100*25
=2500j........ans
kinetic energy =1/2*mass(v)2-1/2*mass(u)2
now change velocity in m/s=15*5/18=25/6
= 30*5/18=25/3
then kinetic energy =1/2*1200*(25/3)2-1/2*1200*(25/6)
now
=1/2*1200(25/3-25/6)
= 600*25/6
=100*25
=2500j........ans
Answered by
0
15 kmph = 15 × 5/18 m/s = 4.167 m/s
30 kmph = 30 × 5/18 m/s = 8.333 m/s
Work = Change in kinetic energy
= 0.5 m (v² - u²)
= 0.5 × 1500 kg × [(8.333 m/s)² - (4.167 m/s)²]
= 39056.25 joules
∴ Amount of work done is 39056.25 joules
30 kmph = 30 × 5/18 m/s = 8.333 m/s
Work = Change in kinetic energy
= 0.5 m (v² - u²)
= 0.5 × 1500 kg × [(8.333 m/s)² - (4.167 m/s)²]
= 39056.25 joules
∴ Amount of work done is 39056.25 joules
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