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Question: i need assistance with theseandnbspandnbspandnbspandnbspandnbsp7andnbspandnbspandnbspandnbspandnbspandnbspwhen two horizontal forces are exerted...

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7.      When two horizontal forces are exerted on a cart, 800 N forward and 400 N backward, the cart undergoes acceleration. What addition force is necessary to produce nonaccelerated motion ?.

(m)        150 N acting forward

(n) 150 N acting backward

(o) 400 N acting forward

(p) 400 N acting backward

(q) 200 N acting backward

(r)  200 N acting backward

8.      The following two blocks are pulled along a smooth frictionless surface.

Find the tension in the rope between two blocks.

(s)  10 N

(t)   15 N

(u) 20 N

(v) 25 N

(w)         30 N

(x) 18 N

9.      In the following system, determine the time for the 27 kg mass to reach the ground if it is released from rest. (assume: g = 9.81 m/s2).

(a) 0.55 s

(b) 0.50 s

(c) 0.58 s

(d) 0.60 s

(e) 0.45 s

(f)  0.15 s

10.  A boy walks 155 m at a speed of 3.5 m/s and then runs for 100 m at 8.2 m/s along a straight line. Calculate his average velocity.

(a) 3.0 m/s

(b) 4.5 m/s

(c) 4.0 m/s

(d) 2.5 m/s

(e) 1.0 m/s

(f)  12.0 m/s