Question

1) Do both the bodies start from the sarne position? 2)Do they have uniform speed? 3)Does anybody have acceleration? 4) What is speed of A? 5) What is speed of B
2)Derive expression of three equations of motion?
3) write various examples of different types of velocity and acceleration from your day to day life.

Answer 1

Hello Mate!

1. Yes because line of motion has started from same position origin.

2. Yes they have a uniform speed as straight line in distance time graph represent uniform motion.

3. No, they have no accelaration because acceleration is 0 in uniform motion.

4. Speed = d / t
= 50m/ 15 s
= 3.33m/s

5. Speed = 100 m / 10 s
= 10m/s

6. ( 1st eq ) Accelaration = slope of V-T graph
Slope =( y2- y1 )/( x2 - x1 )
a = ( v - u ) / t - 0
at = v - u
at + u = v

( 2nd eqn) Area under V-T graph= displace ment

Area of rectangle + area of triangle
l × b + 1/2 × b × h
t × u + 1/2 × t × ( v - u )
t × u + 1/2 × t × at
s = ut + at^2 / 2

( 3rd equation) Area under V-T graph=displacment

Area of trapezium = 1/2 × h ( a + b )
s = 1/2 ×t( v + u )
s =( ( v - u )/ 2as ) × ( v + u )
2as = v^2 - u^2

7. When we walk with same speed.
A freely falling ball have a constant acceleration.
A car moving in traffic has a variable acceleration.

Hope it helps☺!✌