Explanation

a) Average velocity = \(\frac{u + u}{2}\)

From equation V = u + at

Aeverage velocity = \(\frac{u + u + at}{2}\) = \(u + \frac{1}{2} at\)

Distance covered = Ave. vel. x time

x = (u + \(\frac{1}{2}\)at)t

x = ut +s

(b)i) Newton's second law of motion states that the of change of momentum is proportional to the lied force and takes place in tho direction of the force.

(ii) The principle of conservation of energy es that energy is neither created nor destroyed can be changed from one form to another. The law of floatation states that an object wil t in a fluid when the upthrust exerted upon it by fluid in which it floats equals the weight of the

(c) Mass of air displaced = mass of ballon on and contents V x density of A air

= V x density of gas + content

V x 1.29 = v x 0.54 + 0.030

V = \(\frac{0.03}{0.75}\) = 0.04m\(^{3}\)

Correct Answer: D) 3-4-1-5-2

Explanation

This Biology question is asking about the order of the components involved in the movement of a reflex action. The components are the central nervous system, muscle, skin, sensory nerve, and motor nerve. The question wants to know which sequence indicates the correct path of these components. The correct sequence of these components involved in the movement of a reflex action is option D: 3-4-1-5-2. This means that the correct path starts with the skin, followed by the sensory nerve, then the central nervous system, the motor nerve, and finally the muscle. In a reflex action, the skin acts as a receptor, which detects the stimulus. The sensory nerve then transmits the information from the skin to the central nervous system, which is responsible for processing the information and making a decision. The motor nerve then carries the response from the central nervous system to the muscle, which is the effector that produces the response. It is important to note that reflex actions are rapid and automatic responses to a stimulus that do not require conscious thought. They are important for protecting the body from harm or injury. In summary, option D: 3-4-1-5-2 is the correct sequence of components involved in the movement of a reflex action.

Correct Answer: A. lacks foresight

Correct Answer: A. Tony Lumpkin's mother

Correct Answer: B. time frame of the expenditure

Correct Answer: C. 10cm

Explanation

\(\frac{1}{2}(a+b)\times h = 105cm^2\\

\frac{1}{2}(9+12)\times h = 105\\

h = \frac{105 \times 2}{21} = 10cm\)

Correct Answer: D. 96cm²

Explanation

Area of rhombus = \(\frac{pq}{2}\)

where p and q are the diagonals of the rhombus.

\(\therefore A = \frac{16 \times 12}{2}\)

= 96 cm\(^2\)

Correct Answer: B. can function as a weak acid or a weak base

Correct Answer: A. 100N

Correct Answer: (a) Transpiration