Chapter 2; Describing Motion: Kinematics in One Dimension. Problems 1. A car tha

Question

Chapter 2; Describing Motion: Kinematics in One Dimension. Problems 1. A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2. (a) How long after beginning to accelerate does it take the car to move 3.50 km? (10 poins) (b) How fast is the car moving just as it has traveled 3.50 km? (10 Points) 0 0.550 mist 7 to a stop in 4.0 s, what is the magnitude of its acceleration (assumed constant) in m/s, ar g's (e -9.80 m/s) (10 points). 2. A sports car moving at constant velocity travels 120 meters in 5.0 s. If it then brakes and c

Explanation / Answer

here,

1)

intial speed , u = 7.5 m/s

accelration , a = 0.55 m/s^2

a)

distance , s = 3.5 km = 3500 m

let the time taken be t

s = u * t + 0.5 * a * t^2

3500 = 7.5 * t + 0.5 * 0.55 * t^2

solving for t

t = 100 s

the time taken to move 3.5 Km is 100 s

b)

the final speed , v = u + a * t

v = 7.5 + 0.55 * 100 m/s

v = 62.5 m/s

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