Question

Answer as much as you can .​

Answer 1

Answer:

(1)

Suppose a stationary object of mass (m)moves because of the applied force.Let 'u' be it's initial velocity (here u =0) Let the applied force be F.This generates an acceleration (a)in the object and after time(t),the velocity of the object becomes equal to 'v'.The displacement during the time is (s).The work done on the object,W = F.s

W=Fs

According to Newton's second law of motion,

F=ma ____(1)

Similarly, using Newton's second equation of motion.

s=ut+1 at²

2

s=1 at² _____(2)

2

Therefore,W=ma x 1 at² __using equations (1)&(2)

2

W=1 m (at²)

2

Using Newton's First equation of motion

v=u+at

v=0+at __(here u = 0)

v=at

v² = (at²) ____(4)

W=1 mv² ____using equations (2)&(4)

2

The Kinetic energy gained by an object is the amount of work done on the object.

K.E=W

Therefore,K.E.= 1 mv²

2

Hence proved

(2)

K.E= 1 mv²

2

=1 x 2 x (0.2)²

2

=0.04

Hence proved.

Explanation:

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