If the speed of an object doubles, its kinetic energy becomes
one-fourth
half
four times
double
KE =1/2mv2
If v becomes 2v, then KE = ½m(2v)2 = 4×½mv2 = 4 times initial KE
The length of a simple pendulum is made one-fourth. Its time period becomes :
(a) four times (b) one-fourth
(c) double (d) half.
The current passing through an electric kettle has been doubled. The heat produced will become: (a) half (b) double (c) four times (d) one - fourth