Advertisements
Advertisements
Question
A car accelerates uniformly from a velocity of 18 km/h to 36 km/h in 15 min. What is its acceleration?
Advertisements
Solution
Initial velocity of car u = 18 km/hr.
Final velocity of car v= 36 km/hr.
Time taken by body = 15 min. = 1/4 hr
Acceleration of car a = ( v- u )/t = (36 - 18 ) X 4 = 72 kmh-2.
APPEARS IN
RELATED QUESTIONS
Define the term acceleration due to gravity. State its average value.
A motor bike running at 90 kmh−1 is slowed down to 18 kmh−1 in 2.5 s. Calculate
- acceleration
- distance covered during slow down.
The acceleration of a moving body is constant in magnitude and direction. Must the path of the body be a straight line?
If not, given an example.
State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.
A body has an acceleration of -3.5 ms-2. What is its retardation?
The graph shows how the velocity of a scooter varies with time in 50 s.
Work out: 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 acceleration.
A bus can accelerate with an acceleration of 1 m/s2 . Find the minimum time for the bus to attain the speed of 100 km/s from 50 km /s.
A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?
When a body is said to be in
- uniform acceleration
- non–uniform acceleration?
