Question

An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 9.40 m/s in 2.40 s. (a) What is the magnitude and direction of the bird’s acceleration? (b) Assuming that the acceleration remains the same, what is the bird’s velocity after an additional 1.00 s has elapsed?

Answer 1

DARA a)= CSmkec) 354 =(49) alal Divec tion a (tリ=(isee) 6)(リ= Same a (a) obtained in answey of (aリ sol:

have Ca By definifion of acceleration, we cwhese Cot)change Gacelenationa= tme in CoN)=change velocity in mlsec (2.4 sec) D)-(V T4 mls) (Smls) inaVina CA)

.4 mls- 13mls) -3.6 2.4 is accele ation of the bixd

NOW magnitude of birdls acceleratio0 fаena) (зучs) "(м] - (smle) is magnitude of bixds arceleafion

He@)-1Smls infoont o "a" indicale hat direction of a" ts opPosite to that of intial velo cty ie, "opposite to due north e, due souh." NDRTH Diaection of the EAST WEST Due sourf bixd's acceleafion SOUTH

have, By kipematig we whese )(nitial velocity) inal veloeity (リ=(u+ at) arceleation) a ) time taken) (isec

. ms )+ E1.5)(1) (9.4. -Fm/see) veloci of bid add itonal \sec. affpr an

conclusion: (a]-(iS mls) Die fion of Due sourh 17 a