A car having mass 1000 kg, is moving with speed of 36 km/h. Calculate its momentum and kinetic energy. (Ans. 10,000 kgm/s and 50,000 J) (Verify the value of kinetic energy using K = P2/2 m 'P' is momentum; how kinetic energy is equal to K = P²/2 m ? Think.)
GSEB - Class 9 Chapter - 1. Work, Energy and Power Page 11
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mass of car=1000Kg
velocity car 36km/hr= 36*5/18 = 10m/s
momentum= m*v=1000*10=10000kgm/
k.E.=1/2*(m.v^2)
p^2= m^2v^2
p^2/2m=1/2 * m v^2 which k.E.
k.E.= P^2 /2m=10000×10000/(2×1000)
100000/2
50000 J
velocity car 36km/hr= 36*5/18 = 10m/s
momentum= m*v=1000*10=10000kgm/
k.E.=1/2*(m.v^2)
p^2= m^2v^2
p^2/2m=1/2 * m v^2 which k.E.
k.E.= P^2 /2m=10000×10000/(2×1000)
100000/2
50000 J
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