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
A tortoise moves a distance of 100 metres in 15 minutes. What is the average speed of tortoise in km/h ?
A motorcyclist drives from place A to B with a uniform speed of 30 km h-1 and returns from place B to A with a uniform speed of 20 km h-1. Find his average speed.
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 ?
A car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h. Calculate the average speed 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)`.
A train is moving with a velocity of 90 km h-1 . It is brought to stop by applying the brakes which produce a retardation of 0.5 ms-2 Find :
(i) The velocity after 10 s , and
(ii) the time taken by the train to come to rest .
Define variable velocity and give one example.
A speeding car changes its velocity from 108 kmh−1 to 36 kmh−1 in 4 s. Calculate its deceleration in
- ms−2
- kmh−2.
Write down the type of motion of a body along with the A – O – B of the following distance – time graph.
Define speed of a body.
