2.A ball is thrown horizontally from the top of a 20-m high hill. It strikes the ground at an angle of ㆍ450. With what speed was it thrown? Use g = 10 m/s². 
(A) 14m/s
(B) 20m/s
(C) 28 m/s
(D) 32 m/s
(E) 40 m/s

88. The functions of cholesterol include all the following except: (A) A precursor of bile (B) A precursor of vitamin D (C) As an intracellular energy source (D) Sustain cell membrane structure (E) Essential for producing steroid hormone

89. The following statements about lipid transport are all correct except: (A) Dietary triacylglycerols and cholesterol from intestine is carried by chylomicrons to muscle and adipose tissues. (B) VLDL carries triacylglycerols and cholesterol from liver to muscle and adipose tissues. (C) LDL carries mainly triacylglycerol from liver to muscle and adipose tissues. (D) HDL synthesized from liver picks up cholesterol in the bloodstream and transported back to liver. (E) The loss of triacylglycerols converts VLDL to LDL.

90. Which of the following posttranslational modifications is applied to produce active insulinmolecules in pancreatic β cells:① Phosphorylation of Ser residues② Glycosylation of Asn residues③ Cleavage of a signal sequence④ Proteolytic cleavage of internal sequences⑤ Formation of disulfide bonds(A) ③④⑤ (B) ②③④ (C) ②⑤ (D) ①②④⑤ (E) ①②③⑤

1.An object starts from rest at the origin and moves along the x axis with a constant acceleration of 4 m/s2. Its average velocity as it goes from x = 2 m to x = 8 m is: (A) 1 m/s (B)2m/s(C)3m/s (D) 5m/s (E) 6 m/s

3.The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 6.0 m/s. At an instant when the magnitude of the total acceleration is 10.0 m/s, what is the speed of the particle?(A)3.0 m/s(B)4.0 m/s (C) 5.0 ml/s (D)6.0 m/s(E)8.0 m/s

4.Block A, with a mass of 10 kg, rests on a 30* incline. The coefficient of kinetic friction is 0.20. The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, with a mass of 8.0 kg, is attached to the dangling end of the string (take √3 1.7 and g =10 m/s2). The acceleration of B is: (A) 0.72 m/s2, up (B) 0.72 m/s2, down (C) 2.6 m/s2, , up (D) 2.6 m/s2, down (E) 0 m/s2

5.Block A, with mass ma, is initially at rest on a horizontal floor. Block B, with mass mb, is initially at rest on the horizontal top surface of A. The coefficient of static friction between the two blocks is Hh- Block A is pulled with a horizontal force It begins to slide out from under B if the force is greater than: (A)mAg (B) mBg (C) u smig (D)usmBg (E)us(mA+mB)g

6.As a 2.0-kg object moves from m, the constant resultant force acting on it is equal to N. If the speed of the object at the initial position is 4.0 m/s, what is its kinetio energy at its final position? (A)62 J (B)53J (C)73J (D)86J (E)24 J

7.A certain pendulum consists of a 1.5-kg mass swinging at the end of a string (length = 2.0 m). At the lowest point in the swing the tension in the string is equal to 20 N. To what maximum height above this lowest point will the mass rise during its oscillation? Take g = 10 m/s2 (A)77 cm (B)50 cm (C)63 cm (D)33 cm (E)95cm

8. A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.0 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block? (A)0.51 kJ (B) 0.29kJ (C) 0.80 kJ(D) 0.13 kJ(E) 20.0 kJ