Question

an object starting from rest Travels 30m M distance in first 2 second and next 240m in next 4 seconds what will the velocity after 7 second from the start​

Answer 1

Answer:

ok velocity will be 43/ m s

Answer 2

Answer:

v = u + a*t

Initial Velocity u

m/s

Final Velocity v

m/s

Time t

s

Acceleration a

m/s²

RESET VALUES

ANSWER

From s=ut+

2

1

at

2

In first 2 s,

s=20m

20=

2

1

a(2)

2

=2a

a=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+

2

1

a

′

t

2

160=20×4+

2

1

a

′

(4)

2

80=8a

′

a

′

=10 m/s

2

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

v=0+10×7=70 m/s

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