PHYS 6A Midterm: Physics 6A Practice Midterm1 solutions
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PHYS 6A Full Course Notes
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Physics 6a: you drive your car at a speed of 40 km/hr for 1 hour, then slow down to 30 km/hr for the next 20 km. We can draw a simple diagram with distances and times. For each section we use the formula distance = speed x time . 36 km hr answer (b: a speeding car is traveling at 40 m/s down a straight road. The driver slams on the brakes, and the car comes to a complete stop in 5 seconds. We can use one of our kinematics formulas. This formula will work, but we need to find the acceleration first. Answer (c: a rock is thrown upward from the top of a 300-meter high cliff. First we can draw a sketch and choose a coordinate system. That makes the initial height y0 = 300m. We also know the initial velocity, and the final height. We can use one of our basic kinematic equations: y y v.
