Question

the kinetic energy of a body of mass 15kg is 30j . what is its momentum?

Answer 1

K.E = p²/(2m)
p² = 2m × K.E
p² = 2 × 15 × 30
p² = 30²
p = 30 kgm/s

Momentum is 30 kgm/s

Answer 2

K.E = 1/2mv^2
30 = 1/2 x 15 x v^2
60/15 = v^2
v = ✓4 = 2 m/s

Momentum = 15 x 2 = 30 kg m/s

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