Question
D) What is the equation of the velocity as a function of time? (Spoiuts) c) At what time (in terms of A and B) is the velocity equal to zero? CSpoiuts d) What is the maximum value of “x" in terms of A and B? Cspotut e) What is the equation of the acceleration as a function of time? (speluts Problem 3.- Motion with Constant Acceleration A car moving at 50 km/h approaches an intersection just as the traffic light turns yellow. The yellow light lasts 2.0 s. before turning to red. The car was 23 m. away i decides to speed up to cross the intersection before the light turns red. y from the intersection that is 15 m. wide. The driver a) Find the car's minimal constant acceleration? (5 points) b) Find the car's speed after it crossed the intersection? (5 points) Problem 4. Free Fall A ball is thrown directly upward and reaches a maximum height Y max= 53.7 m. a) Find the magnitude of the ball's initial velocity? (10 points) to the starting noint? (5 point)
Explanation / Answer
Q3.
a)
vi = 50 kmph = 13.89 m/s
t = 2 s
s = 23 m + 15 m = 38 s
s = vi*t + 1/2*a*t^2
=> 38 = 13.89*2 + 0.5*a*4
=> a = 5.11 m/s^2
b)
vf = vi + at
=> vf = 13.89 + 5.11*2
=> vf = 24.11 m/s
Pls post other ques separately
