solve this question if answer don't know don't message
Answers
Answer:
Explanation:
QUESTION NO. 1 Speed is defined as the rate at which an object covers a distance
Acceleration is the rate of change of velocity
Answer: The acceleration of the bus that decreases its speed from 80 kilometers per hour to 60 km per hour in 5 seconds is -1.12m/s2
Let's look into the relationship between acceleration, speed and time
Explanation:
Acceleration a = (V - U) / t
Given: Initial velocity (U) = 80 km/hr = 80 × 5/18 = 400/18 = 22.2m/sec
Final velocity (V) = 60 km/hr = 60 × 5/18 = 300/18 = 16.6m/sec
Acceleration a = (V - U) / t
= (16.6 - 22.2)/5
= -5.6/5
= -1.12 m/s2
Negative sign indicates that the velocity is decreasing.
Therefore, the acceleration of the bus that decreases its speed from 80 kilometers per hour to 60 km per hour in 5 seconds is -1.12m/s2
QUESTION NO.11 Given parameters
Initial velocity (u) = 0
Final velocity (v) = 40 km/h
v = 40 × (5/18)
v = 11.1111 m/s
Time (t) = 10 minute
t = 60 x 10
t = 600 s
Acceleration (a) =?
Consider the formula
v = u + at
11.11 = 0 + a × 600
11,11 = 600 a
a = 11.11/600
a = 0.0185 ms-2
3RD ONE ON THE ROW OF GIVEN QUESTION Given side of square =10m, thus perimeter P=40m
Time taken to cover the boundary of 40 m =40 s
Thus in 1 second, the farmer covers a distance of 1 m
Now distance covered by the farmer in 2 min 20 seconds = 1×140=140m
Now the total number of rotation the farmer makes to cover a distance of 140 meters =
perimeter
totaldistance
=3.5
At this point, the farmer is at a point say B from the origin O
Thus the displacement s=
10
2
+10
2
from Pythagoras theorem.
s=10
2
=14.14m QUESTION NO.12 Distance-Time Graph for Uniform Motion
As in uniform motion, the distance time graph would be a straight line, because the equal distance is covered in equal units of time.
HOPE IT HELPS YOU