D)
(()(){({)({)(()({)())({)()({)()()()9
Answer:
(i) 
(ii) 
Explanation:
Let t be the average thickness of the sheet.
Given that:
Density of the aluminum sheet is 
Mass of sheet = 60.7 g
Length of sheet = 50.0 cm
Width of sheet = 30.0 cm
(i) Using, Density=Mass/Volume


Hence, the volume of the sheet is
.
(ii) Now, as this aluminum sheet is in the shape of a cuboid, so the volume of the sheet is



Hence, the average thickness of the sheet is
.
Work = force × distance
= 35 N × 200 m
= 7000 J
Answer:
a. 1.5 m/s
Explanation:
We will apply the law of conservation of energy in this situation between the initial position and the lowest point of the swing:

where,
m₁ = mass of ball = 1.6 kg
m₂= mass of block = 0.8 kg
u₁ = initial speed of ball = 0 m/s
u₂ = initial speed of block = 0 m/s
v₁ = final speed of ball = ?
v₂ = final speed of block = 3 m/s
Therefore,

v₁ = 1.5 m/s
Therefore, the correct option is:
<u>a. 1.5 m/s</u>