A van of mass `1500kg` travelling at a speed of `54 km h^(-1)` is stopped in `10 s` Assuming that all the machantical energy lost appeats as thermal energy in the brake mechanical find the evarage in the brake of thermal energy in cal `s^(-1)`

A van of mass `1500kg` travelling at a speed of `54 km h^(-1)` is stop

1.	A van of mass `1500kg` travelling at a speed of `54 km h^(-1)` is stopped in `10 s` Assuming that all the machantical energy lost appeats as thermal energy in the brake mechanical find the evarage in the brake of thermal energy in cal `s^(-1)`
Answer» Correct Answer - A::C::D Mass of van `= 1500kg` `speed V = 54km//h` `= 54 xx ((5)/(18)) = 15 m//s` `Total K.E. = (1)/(2) mv^(2)` ` = (1)/(2)xx 1500xx (15)^(2)` ` = 750xx 225` = 168750J` `= 40178cal` Loss in the tatal energy `= 40175 cal` In `1` second loss in the total energy `= (40178)/(10) = 4017.8` ` = 4000 cal//sec` THe avarage thermal energy cal//sec `= 4000 cal//sec

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A van of mass `1500kg` travelling at a speed of `54 km h^(-1)` is stopped in `10 s` Assuming that all the machantical energy lost appeats as thermal energy in the brake mechanical find the evarage in the brake of thermal energy in cal `s^(-1)`

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