16. A 2 kg block is set moving with an initial speed of 6 m/\'s on a rough horiz

Question

16. A 2 kg block is set moving with an initial speed of 6 m/'s on a rough horizontal surface. If the force of friction is 3 N, approximately a) 108 m b) 24 m c) 12 m d) 72 m e) 36 m is 3 N, approximately how far does the block travel before it stops? 17. A 15 N net force is applied for .9 sec to a 3 kg box that is initially at rest. What is the speed of the box at the end of the .9 see interval? a) 4.5 m/s b) 9 m/s c) 11.25 m/s d) 66.67 m/s e) 6 m/s energy is dissipated in braking a 750 kg car to a stop from an initial speed of 20 m/s? ac) 15,000 J ad) 225,000 J be) 450,000 J bd) 7,500 3 de) 150,000 J

Explanation / Answer

16]

Fnet = ma =

= a = F/m = - 3/2 = - 1.5 m/s2

and S = [v2 - u2]/2a

= S = [0 - 62]/-3 = 12 m [answer c]

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