Question

how to find time if v² vs x graph is given. where v is velocity and x is displacement​

Answer 1

Answer:

pagal kutta gifuchzjgjduflvn. vvkbk m vkvk n kvkvivm mvjvkvkvk k

Answer 2

Explanation:

Slope v

2

-s graph

m=−

100−50

2000−1500

= -10

Relation between v

2

and s: v

2

= -10 s + C

At s = 50,v

2

= 2000

2000 = -10 x 50 + C

C = 2500

v

2

= -10 s + 2500

dt

2vdt

=−10

dt

ds

2va = -10v

a = -5 ms

−1

To find initial velocity:

Put s = 0, v = u

u

2

= 2500

u = 50 m/s

Apply v = u +at

0 = 50 - 5T

T = 10s

Displacement during last two seconds:

S=S

t=10s

−S

t=8s

=[ 50 x 10 - (1/2) 5 x (10)

2

] - [50 - (1/2) x 5 (8)

2

] = 10 m