Plzz answer fast (5)
Answers
Answer:
1.Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
2.Average velocity would be equal to average speed when the total distance travelled equals the net displacement of a particle. This happens when a particle moves along a straight line in a fixed direction.
3.Odometer of an automobile is used to measure the distance travelled by a vehicle . ...
4.Uniform motion is a motion in which the velocity vector remain constant at every point of time so that the path of object look like straight line when it is in uniform motion.
5.Let the distance between the spaceship and the ground station be 'S' .
Then, S=vt
where, v= speed of signal =3×10
8
m/s
t= time taken =5min=5×60s=300s
∴s=3×10to the power 8
×300=9×10 to the power 10
Explanation:
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1-Speed:
(i) Speed is defined as the distance travelled by the body per unit time.
(ii) Speed = timetaken/distance travelled.
(iii) Speed is always positive
Velocity :
(i) Velocity of a moving body is defined as is rate of change of its position with time in a particular direction.
(ii) Velocity = timetaken/displacement
(iii) Velocity is a vector quantity.
(iv) Velocity can be negative.
2-
The average speed is equal to average velocity when distance traveled by a body is equal to displacement. distance=displacement when the body moves in a straight line. so when the body moves in a straight line the average velocity is equal to average speed.
3-
The odometer measures the distance travelled by a vehicle.
4-
The path looks like a straight line.
5-
Let the distance between the spaceship and the ground station be 'S' .
Then, S=v×t
where, v= speed of signal =3×10^8 m/s
t= time taken =5min=5×60s=300s
∴s=3×10 ^8 ×300
=9×10^ 10 m
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