How to solve with my physics question?

Posted on 2014-12-13 07:42:00 in Physics by CHRIS

1. A car can be braked to a stop from the autobahn-like speed of 201 km/h in 150 m. Assuming the acceleration is constant, find its magnitude in (a) SI units and (b) in terms of g. (c) How much time Tb is required for the braking? Your reaction time Tr is the time you require to perceive an emergency, move your foot to the brake, and begin the braking. If Tr = 400 ms, then (d) what is the ratio Tb/Tr?
Dark sunglasses delay the visual signals sent from the eyes to the visual cortex in the brain, increasing Tr. (e) In the extreme case in which Tr is increased by 100 ms, how much farther along the road does the car travel during your reaction time?
(a) Number Units

2. At time t = 0, a car and a truck are side by side on a freeway:

car's velocity just then is zero
car's constant acceleration is 6.0 m/s2
truck's velocity just then is 8.00 m/s
truck's constant acceleration is 2.00 m/s2

How far down the road is the point where the car and truck will again be side by side?

3. A beverage can is dropped (released) from a height of 80.0 m. How much time does it take to fall from height 30.0 m to height 20.0 m?

4. A Pepsi bottle is dropped (released) from a height of 60.0 m. How fast is it going (m/s) when it still has 1.20 s left in its fall?

5. A rock is thrown downward at 10 m/s from a height of 100 m. How high is it 1.00 s before it hits?

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