1.

The enrgy The energy reqduired to accelerate a car from 10 m/s to 20 m/s compared with that required to accelerate from 0 to 10 m/sec in the same interval of time overcoming same resistance is :

Answer»

twice
4 times
3 times
same

Solution :`(W_(1))/(W_(2))=(1/2m(v_(2)^(2)-v_(1)^(2)))/(1/2m(v_(2)^(2)-v_(1)^(2)))=(20^(2)-10^(2))/(10^(2)-0^(2))=(300)/(100)`


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