Answer:
(a) (1) -32ft/s
(2) -25.6ft/s
(3) -24.8ft/s
(4) -24.16ft/s
(b) -24 ft/s
Explanation:
First of all, we need the position for every instant mentioned in order to calculate average velocities:
Y(2) = 2 ft
Y(2.5) = 0 ft
Y(2.1) = 13.44 ft
Y(2.05) = 14.76 ft
Y(2.01) = 15.7584 ft
Let's now calculate average velocities:
Now, for the instantaneous velocity, we derive the expression for y:
V(t) = 40 - 32t For t=2s V(2) = -24ft/s
Answer:
β = 88°
Explanation:
Given,
Angle between the mirror, α = 46.0 °
Let 'i' and 'r' be the angle made with mirror by incident and reflected ray respectively.
Now,
α + i + r = 180°
i + r = 180°-46°
i + r = 134°
we know, angle of incidence and angle of reflection are equal.
Let β be the required angle
β + (180°-2i) + (180°-2r) = 180°
β -2(i+r) = -180
β = -180° + 2 x 134°
β = 88°
Hence, the angle between them is equal to 88°.
The answer is A. Proton. Protons have the opposite charge to electrons, which have negative charges.
Answer:
Sound is produced by an object vibrating and creating a pressure wave.
Explanation:
In milimetres:54000
or 54 metres