Question

pls answer this question ​

Answer 1

YOUR ANSWER

1:4:9

Explained:

we know that,

acceleration=

(final velocity - initial velocity)/time

Therefore,

a=(v-u)/t

v=u+at

Now,

Kinetic energy=m*v*v/2

Substitution of v by the above result,

K.E=[m(u+at)^2]/2

For first second:

K.E=[m(0+a*1)^2]/2

=m(a^2)/2

Similarly,

For 2nd second,

K.E=m(2a)^2/2

For 3rd second,

K.E=m(3a)^2/2

Therefore,

Ratio:

=[m(a^2)/2]:[m(2a)^2/2]:[m(3a)^2/2]

=(a^2):4(a^2):9(a^2)

=1:4:9