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ICSE Class 9 Answered

Calculate the kinetic energy of car of mass 500kg moving with velocity of 36km/h.find the kinetic energy if the velocity of car double  
Asked by shifatajshaikh947 | 11 Jan, 2021, 08:56: AM
answered-by-expert Expert Answer
Velocity of car, v = 36 km/hr = 36 × (5/18) = 10 m/s
 
Mass of car , m = 500 kg
 
Kinetic energy = (1/2) m v2 = (1/2) × 500 × 10 × 10 = 25000 J = 25 kJ
 
KInetic energy is proportional to square of velocity .
 
If velocity doubles, Kinetic energy will becomes four times of its initial value.
 
Hence if velocity doubles , Kinetic energy = 100 kJ = 105 J
Answered by Thiyagarajan K | 11 Jan, 2021, 09:10: AM

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