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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ७

From the given v-t graph it can be inferred that an object is

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प्रश्न

From the given v-t graph it can be inferred that an object is

विकल्प

  • in uniform motion

  • at rest

  • in non - uniform motion

  • moving with uniform accelerations

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उत्तर

moving with uniform accelerations

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 2: Force and Motion - Evaluation [पृष्ठ २५]

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सामाचीर कलवी Science - Term 1 [English] Class 7 TN Board
अध्याय 2 Force and Motion
Evaluation | Q I. 4. | पृष्ठ २५

संबंधित प्रश्न

A body falls freely from a certain height. Show graphically the relation between the distance fallen and square of time. How will you determine g from this graph?


A train starts from rest and accelerates uniformly at a rate of 2 m s−2 for 10 s. It then maintains a constant speed for 200 s. The brakes are then applied and the train is uniformly retarded and comes to rest in 50 s. Find

  1. The maximum velocity reached,
  2. The retardation in the last 50 s,
  3. The total distance travelled,
  4. The average velocity of the train.

A vehicle is accelerating on a straight road. Its velocity at any instant is 30 km/h. After 2 s, it is 33.6 km/h, and after further 2 s, it is 37.2 km/h. Find the acceleration of the vehicle in m s-2. Is the acceleration uniform?


If a body is moving with a constant velocity its acceleration is ______.


From the diagram given below, calculate deceleration.


Diagram is given below shows velocity – time graph of car P and Q, starting from the same place and in the same direction. Calculate the Acceleration of car Q between 2 s – 5 s.


An aeroplane lands at 216 kmh−1 and stops after covering a runway of 2 m. Calculate the acceleration and the time, in which it comes to rest.


A truck running at 90 kmh−1, is brought to rest over a distance of 25 m. Calculate the retardation and time for which brakes are applied.


A motor bike running at 90 kmh−1 is slowed down to 18 kmh−1 in 2.5 s. Calculate

  1. acceleration
  2. distance covered during slow down.

What does a positive acceleration mean?


Write the SI unit of retardation.


The distance covered by a body is directly proportional to the square of the time elapsed. What can you say about its acceleration?


State if the following situation is possible:
A body moving with a constant velocity in an accelerated motion.


Is it possible for an accelerating body to have constant speed?


A car accelerates uniformly from a velocity of 18 km/h to 36 km/h in 15 min. What is its acceleration?


A car accelerates to a velocity of 30 m/s in 10 s and then decelerates for 20 s so that it stops. Draw a velocity-time graph to represent the motion and find:
The Deceleration.


Figure represents graphically the velocity of a car moving along a straight road over a period of 100 hours.

Calculate the acceleration along AB and the retardation along BC.


The rate of change of velocity is ______.


State whether true or false. If false, correct the statement.

Acceleration can get negative value also.


What is meant by negative acceleration?


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