it is denoted by
v 2 - u 2 = 2as
Where
v = Final Velocity
u = Initial Velocity
s = Distance Travelled
a = acceleration
To solve problems using equations of motion, we should remember that
- If body starts from rest, its Initial velocity = u = 0
- If we drop a body from some height, its Initial velocity = u = 0
- If body stops, its Final velocity = v = 0
- If body moves with uniform velocity, its Acceleration = a = 0
Questions
Q 2 Page 110 - A train is traveling at a speed of 90 km h–1. Brakes are applied so as to produce a uniform acceleration of – 0.5 m s-2. Find how far the train will go before it is brought to rest.
Q 5 Page 110 - A stone is thrown in a vertically upward direction with a velocity of 5 m s-1. If the acceleration of the stone during its motion is 10 m s–2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach there?
NCERT Question 7 - A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m s-2, with what velocity will it strike the ground? After what time will it strike the ground?
Example 8.5 - A train starting from rest attains a velocity of 72 km h–1 in 5 minutes. Assuming that the acceleration is uniform, find (i) the acceleration and (ii) the distance travelled by the train for attaining this velocity.
