Question

Question 6.9 A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to

(i) t^(1/2)
(ii) t
(iii) t^(3/2)
(iv) t^2

Chapter Work, Energy And Power Page 136

Answer 1

Solution
Mass of the body is m

Acceleration of the body is a

Using Newton’s second law of motion, the force experienced by the body is given by the equation:

F = ma

Both m and a are constants. Hence, force will also be a constant.

F = ma = Constant

The velocity for uniformly accelerated motion is
v = u + at
= 0 + at
= at

Power is given by the relation:
= Fv
P = ma ∙ at
P = ma^ 2 t

As acceleration is constant, hence
P∝t

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
ANSWER ---------- (ii) t
<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

HOPE IT HELPS :):):):):):):)

Answer 2

Hy!!!!!!!!!!


let suppose
Mass of the body = m

Acceleration of the body = a

Using Newton’s second law of motion, the force experienced by the body is given by the equation:
F = ma
Both m and a are constants. Hence, force F will also be a constant.
so power is directly proportional to t
answer is 2
hope it help