Question

an object starts from rest Travels 20 m in first 2 seconds and 160 metre in next 4 seconds . what will be the velocity of till 6 second from the starts ?​

Answer 1

$\huge\frak\pink{Answer}$

From s=ut+ 1/2at 2

In first 2 s,

s=20m

20= 21 a(2) 2 =2aa=10 m/s 2

Velocity at the end of 2 s is

v=u+at=0+10×2=20m/s

In next 4s, s=ut+

21 a ′ t 2160=20×4+ 2 a ′ (4) 280=8a a

′=10 m/s 2

It shows that acceleration is uniform. From v=u+at

v=0+10×7=70 m/s

Answer: (D) 70

Answer 2

Answer:

$\huge\frak\pink{Answer}$

From s=ut+ 1/2at 2

In first 2 s,

s=20m

20= 21 a(2) 2 =2aa=10 m/s 2

Velocity at the end of 2 s is

v=u+at=0+10×2=20m/s

In next 4s, s=ut+

21 a ′ t 2160=20×4+ 2 a ′ (4) 280=8a a

′=10 m/s 2

It shows that acceleration is uniform. From v=u+at

v=0+10×7=70 m/s

Answer: (D) 70

Explanation:

Oye tera kya h jab chahe flw karti ho jab chahe unflw karti ho xD