if the mass of car is 200kg then how much work will be done to increase its velocity from 36km per hr to 72 km/hr
Answers
Answered by
0
Answer:
Correct option is
B
131250J
Initial Velocity, u=54km/hr=15m/s
Final velocity , v=72km/hr=20m/s
Mass =1500kg
Initial kinetic energy
2
1
mu
2
⇒
2
1
1500×15×15=168750J
Final kinetic energy
2
1
mv
2
⇒
2
1
1500×20×20=300000J
So, change in kinetic energy = work done=300000−168750=131250J
Answered by
0
u=36*5/18 =10 m/s
v =72 *5/18 =20 m/s
m = 200 kg
work done = (1/2)*200*(20*20-10*10)
=100 (400-100) = 100 * 300 =30 K JOULES
Explanation:
Similar questions