Answer:
b) 18 m/s is the correct answer.
Explanation:
initial velocity(u) = 30m/s
acceleration(a) = -4m/s²
time(t) = 3 seconds
final velocity(v) = ?
using the formula,
a = (v-u)/t
or, -4 = (v-30)/3
or, -12 = v-30
or, v = -12+30
so, v = 18 m/s
Given parameters:
Volume of water in the tank = 750litres
Length of the tank = 150cm
Breadth of tank = 50cm
Unknown:
Height of the tank = ?
To solve this problem, we must understand the concept of volume. Volume is a property of solid bodies. It is mathematically derived as:
Volume = length x Breadth x height
The unknown here is the height and we should go ahead to solve for it.
<em>But the units are inconsistent. </em>
Therefore, convert litres to cm³;
1 litre = 1000cm³
750 litres = 1000 x 750 = 750,000cm³
Now input the parameters and solve for the height;
750000 = 150 x 50 x height
height = = 100cm
Therefore, the height of the tank is 100cm
The answer is periosteum. Hope this helps!