A driver is traveling in a car down a 5% grade. A downed tree comes into view. The tree is blocking the entire road 400 feet away. The driver is alert and so his perception-reaction time is 20 seconds. The pavement is dry and the car's tires are new. The driver brakes using the emergency brakine rate of 14.8 ft/sec. Show your calculations and determine if the car will hit the douned tree or Speed is 55 mph.

Q: why did you choice 40% and 60% Please explain this part deeper

A: 40% of aggregate A is blended with 60% aggregate B

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Q: oh no! it appears that you copied this answer from a similar question. The answer is wrong btw.

A:

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Design of structures using FEA

An arrangement, in which various members are interconnected with their constrained relative motion, the whole arrangement is then known as a structure. The degree of freedom of such a structure is zero. In such a structure, the load can act throughout the length of the structure or at the joints.