= -0.4 ms.
The acceleration of the bicycle in the 24
first case is 0.2 ms and in the second
case, it is -0.4 ms.
uestions
1. When will you say a body is in Lo
(U uniform acceleration? (ii) non-
uniform acceleration?
2. A bus decreases its speed from
80 km h to 60 km h in 5 s
Find the acceleration of the bus.
3. A train starting from a railway
station and moving with uniform
acceleration attains a speed
40 km h in 10 minutes. Find its
acceleration
50 x 10
S00103
I
10
6x6 =
3618
Answers
answer is up
The motion of a particle along a straight line at a constant acceleration is called the "Uniformly Accelerated Motion."
In this chapter, we need to first define velocity and acceleration as was done in
Velocity: Velocity is defined as the change in displacement per unit of time. Note that both velocity and displacement are vector quantities. Speed is defined as the change in distance per unit of time. Here both speed and distance are scalar quantities. The average speed v is mathematically shown as:
Δ pronounced "delta" means a change. For example, Δx means a change in distance and Δt means a change in time. Δ also means "final - initial."
Δx = x2 - x1 and Δt = t2 - t1.
Example 1: A car travels a distance of 350 miles in 5.0 hours. Find its average speed.
