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Question: i need assistance with theseandnbspandnbsp14andnbspandnbspa car has an initial velocity...

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I need assistance with these.

 

 

14.  A car has an initial velocity of 2.5 m/s. After displacement of 15 m, its velocity becomes 5.0 m/s. Find the acceleration of the car. 

 

(y) 0.525 m/s2

(z) 0.625 m/s2

(aa)       0.425 m/s2

(bb)       0.225 m/s2

(cc)       0.125 m/s2

(dd)       0.825 m/s2

 

 

 

 

 

 

 

 

 

15.  A 25 kg hanging object is connected by a light, inextensible cord over a light, frictionless pulley to a 3.2 kg block that is sliding on a flat table. Assuming a smooth frictionless surface of a flat table find the tension in the string. (assume: g = 9.81 m/s2).

 

(a)   28 N 

(b)   27 N 

(c)   25 N 

(d)   12 N 

(e)   20 N 

(f)    15 N 

 

19. An object moving in a straight line has the displacement-time graph shown. Find the average velocity for the trip. 

 

 

(a) 2.2 m/s 

(b) 1.2 m/s 

(c) 1.5 m/s 

(d) 0.0 m/s 

(e) 12.2 m/s 

(f)  16.0 m/s 

 

 

 

 

20. A 1,300 kg car accelerates uniformly from rest to 60km/h over a distance of 40 m. How much force is being applied by the engine to do this ?. 

 

(a) 4.5 ·103 N 

(b) 4.0 ·103 N 

(c) 3.5 ·103 N 

(d) 3.0 ·103 N 

(e) 1.5 ·103 N 

 

(f)  1.0 ·103 N      

 

 

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