5. A motorist drives 165 km from one city to another in 2.60 h but makes the ret

Question

5. A motorist drives 165 km from one city to another in 2.60 h but makes the return trip in only 1.60 h. What is the average speed for the total trip? km/h 6. An earthquake releases two types of traveling longitudinal waves in rock are 9.0 km/s and 5.4 km/s respectively. A seismograph records the arrival of the transve longitudinal waves. Assuming the waves travel in straight lines, how far away is the center of the earthquake? g seismic waves, called transverse and longitudinal waves. The average speed of the transverse and km of 140 m, then slows down to a stop with a 7. A car starting from rest moves in a straight line with constant deceleration of 2.70 m/s2. What is the total time of the travel? . A ear sarting from rest moves in a strnigh line with a consa0 m/s for a distance of 140 m, then slows down to a stop witha 8. A ball is thrown vertically upward from the edge the water below. Determine the magnitude of the velocity of the ball just before it strike the water. of a bridge 26.5 m high with an initial speed of 14.0 m/s. The ball falls all the way down and strikes m/s An car initially at rest experiences an acceleration of 1.70 m/s for 5.90 s then travels at that constant velocity for another 8.40s. What is the magnitude of the object's average velocity over the 14.3 s interval? m/s

Explanation / Answer

Sol5) We know, Average Speed=Total distance/Total time taken

Total Dis=165km+165km=330km

Total Time=2.6hrs+1.6hrs=4.2 hrs

Average Speed=330/4.2=78.57 km/hr

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