Advertisements
Advertisements
प्रश्न
Write the formula for acceleration. Give the meaning of each symbol which occurs in it.
Advertisements
उत्तर
Acceleration is the change in velocity per unit time; it is a vector quantity.
`"Acceleration" = "Change in velocity"/"Time taken"`
The above expression can also be written as :
`a = (v-u)/t`
Where,
a = Acceleration
v = Final velocity
u = Initial velocity
t = Time taken
APPEARS IN
संबंधित प्रश्न
In addition to speed, what else should we know to predict the position of a moving body ?
The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. How fast must the train travel the next 100 km, so as to average 70 km/h for the whole journey ?
The tip of seconds’ hand of a dock takes 60 seconds to move once on the circular dial of the clock. If the radius of the dial of the clock be 10.5 cm, calculate the speed of the tip of the seconds’ hand of the clock. `("Given" π= 22/7)`.
The graph given alongside shows how the speed of a car changes with time:
(i) What is the initial speed of the car ?
(ii) What is the maximum speed attained by the car ?
(iii) Which part of the graph shows zero acceleration ?
(iv) Which part of the graph shows varying retardation ?
(v) Find the distance travelled in first 8 hours.
Give one example of following motion :
Uniform velocity
Express 15 m s-1 in km h-1.
A car is moving with a velocity 20 m s-1. The brakes are applied to retard it at a rate of 2 m s-2. What will be the velocity after 5 s of applying the brakes?
The velocity-time graph of a moving body is given below in Figure
Displacement in each part AB, BC and CD.
Define average velocity and give one example.
Write down the type of motion of a body along with the A – O – B of the following distance – time graph.
