Question

13. The velocity of a body increases from 2 ms' to 12 ms'in 5 s. The acceleration of the body is :
(d) kms 2
(a) 0.4 ms-2
(b) 2.4 ms-2
(c) 2 ms2
(d) 4 ms-2​

Answer 1

ANSWER:

• The acceleration of the body = 2 m/s².

GIVEN:

• The velocity of a body increases from 2 m/s to 12 m/s

• Time = 5 seconds

TO FIND:

• The acceleration of the body.

EXPLANATION:

$\boxed{\huge{\bold{v=u+at}}}$

v = 12 m/s [ This is velocity acquired at the 5th second ]

u = 2 m/s [ This is the velocity which the body had at the beginning ]

t = 5 s

12 = 2 + a(5)

10 = 5a

a = 10/5

a = 2 m/s²

Hence the acceleration of the body is 2 m/s².

SOME MORE FORMULAE:

• S = ut + 1/2 at²

• v² - u² = 2as

Answer 2

The acceleration of the body = 2 m/s².

GIVEN:

The velocity of a body increases from 2 m/s to 12 m/s

Time = 5 seconds

TO FIND:

The acceleration of the body.

EXPLANATION:

v = 12 m/s [ This is velocity acquired at the 5th second ]

u = 2 m/s [ This is the velocity which the body had at the beginning ]

t = 5 s

12 = 2 + a(5)

10 = 5a

a = 10/5

a = 2 m/s²

Hence the acceleration of the body is 2 m/s².

SOME MORE FORMULAE:

S = ut + 1/2 at²

v² - u² = 2as