Hornblede the mineral which is made of more than one element is hornblende
Answer:
Velocity of truck will be 20.287 m /sec
Explanation:
We have given mass of the truck m = 4000 kg
Radius of the turn r = 70 m
Coefficient of friction 
Centripetal force is given 
And frictional force is equal to 
For body to be move these two forces must be equal
So 

The answer to the question is sound
Parallel has more than one circuit or form of energy
series has only one form of energy circuit