Question

the kinetic energy of a body of mass 2kg is 25J its speed is...?

Answer 1

$\huge\star\huge\bold{\underline{\tt{\red{Answer}}}}\star$

______________________________

$\star\star\star\star\star\star\star$

______________________________

$\blacksquare$ Work done=∆KE

$\blacksquare$Work done= ½mv²

$\implies$25J=½ x 2 x v²

$\implies$25=v²

$\implies$v=5m/s

_________________________

$\star\star\star\star\star\star\star$

_________________________

Answer 2

Given;-

m = 2 kg
K = 25 J

To Find;-

Speed (v)

Solution;-

We know that kinetic energy (K) of the body of mass m and velocity v is given by;-

$K = \frac{1}{2}mv^{2}$

$\implies v = \sqrt{2\frac{k}{m} } \\\implies v = \sqrt{\frac{2\times25}{2} } = 5m/s$

Hence, the speed of the body is 5 m/s