The kinetic energy of a block of mass 3 kg is 150 J. Find its momentum.?Explain it plz

Dear student

We know that

K.E = (1/2) mv² 

Put the given values, 
KE = 150 J
m = 3 Kg

150 = (1/2) x 3 x v² 
v = $\sqrt{}$((150 x 2) / 3)
= 10 m/s

Now, momentum 
P = m x v
     = 3 kg x 10 m/s
     = 30 kg m/s

Regards