Question

an object starting from rest travel 20m in and 160m in rest 4.5s,what will be the velocity after 7s from the start ​

Answer 1

Answer:

Displacements, velocities and accelerations have directions as well as sizes (or magnitudes).

You can derive the formulae for motion in a straight line with constant acceleration.

• acceleration -

change in velocity _________________

change in time • distance moved -

average speed time

a -

_____ v u

t average speed -

_____

u v

2

v -

u at s -

( ______

u v

2 )t

For an object moving horizontally, the positive direction is

usually taken as left to right. The starting point of an object

is usually taken as the origin from which displacements are

measured.

For P: s -

4 m and v -

2.5 m s1

For Q: s -

3 m and v -

6 m s1

Example 1

A particle is moving in a straight line from A to B with constant acceleration 3 m s2. Its speed at

A is 2 m s1 and it takes 8 seconds to move from A to B. Find a the speed of the particle at B,

b the distance from A to B.

a -

3, u -

2, t -

8, v -

?, s -

?

a v -

u at

-

2 (3 8)

-

26

The speed of the particle at B is

Answer 2

Explanation:

your question is incomplete mate .

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