hi. An airplane flying directly eastward at a constant speedtravels 323 km in 2.

Question

hi. An airplane flying directly eastward at a constant speedtravels 323 km in 2.0 h. a) what is the average velocity of the plane?_______km/h b) What is its instantaneous velocity? ______km/h A sprinter starting from rest on a straight and level track isable to achieve a speed of 14 m/s in a time o 5.0 s. What is thesprinter's average acceleration? hi. An airplane flying directly eastward at a constant speedtravels 323 km in 2.0 h. a) what is the average velocity of the plane?_______km/h b) What is its instantaneous velocity? ______km/h A sprinter starting from rest on a straight and level track isable to achieve a speed of 14 m/s in a time o 5.0 s. What is thesprinter's average acceleration?

Explanation / Answer

a) the average velocity = ( total distance travelled ) /( total time taken )                                   = 323km / 2h                                   = 161.5 km /h b) as it travelled with constant speed the instantaneousvelocity is equal to the average velocity        i.e 161.5 km/h the sprinters average acceleration is = ( change invelocity ) / time taken                                                         =(14 m/s - 0 m/s )/ 5.0 s                                                        = 2.8 m/s2

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