Question

The position of a body moving in a straight line is
x = (2+2 + 2t + 9), where x is in metre and t is in
dx
second. The velocity v V = of the body at
dt
t = 1 s is
[NCERT Pg. 43]
(1) 6 m/s
(2) 8 m/s
(3) 4 m/s
(4) 2 m/s​

Answer 1

Answer:

Given x

2

=2+t Now differentiating this equation with respect to time we get ,

2x

dt

dx

=1

v=

dt

dx

=

2x

1

Now again differentiating equation A with respect to dx we get v

dx

dv

.

dt

dx

=

2x

1

dx

v

dt

dv

=−

2x

2

1

dt

dv

=−

2x

2

1

(

2x

1

)=−

4x

3

1

Answer 2

Hey mate here is your answer in the given picture.

Hope it helps .