10. +-2.35 points OSCOPhys1 2.3.011 A student drove to the university from her h

Question

10. +-2.35 points OSCOPhys1 2.3.011 A student drove to the university from her home and noted that the odometer on her car increased by 14.0 km. The trip took 18.0 min. (a) What was her average speed? (b) If the straight-line distance from her home to the university is 10.3 km in a direction 25.0° south of east, what was her average velocity? (c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity for the entire trip? km/h km/h (25° S of E) average speed km/h average velocity km/h Additional Materials Reading 11. +-2.35 points OSCOPhys1 2.4016. A cheetah can accelerate from rest to a speed of 20.0 m/s in 6.25 s. What is its acceleration? m/s2 Additional Materials Reading 12. 2.35 points OSColPhys1 2.4019. Assume that an MX missile goes from rest to a suborbital velocity of 6.50 km/s in 30.0 s (the actual speed and time are classified). What is its average acceleration in m/s2? mys2 What is its average acceleration in multiples of g? Additional Materials Reading 13. -2.35 points OSColPhys1 2.5.024. At the end of a race a runner decelerates from a velocity of 10.00 m/s at a rate of 0.300 m/s2 (a) How far does she travel in the next 14.0 s? (b) What is her final velocity? m/s Additional Materials Reading

Explanation / Answer

here,

distance , s1 = 14 km

time taken, t1 = 18 min = 0.3 hr

a)

the average speed , v1 = s1/t1

v1 = 14 / 0.3 km/h

v1 = 46.7 km/h

b)

as the distance is straight line

the average velocity is 46.7 km/h and direction is 25 degree S of W

c)

time taken , t2 = 7.5 hr

the average speed , v3 = 2 * s1 /t2

v3 = 3.73 km/h

for the round trip

displacment is zero

so, the average velocity is also zero

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