A beaver runs at a speed of 2.0\,\dfrac{\text m}{\text s}2.0 s m 2, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction with 45\,\text J45J45, start text, J, end text of kinetic energy.

22.5kg

Explanation:

Since we not told wat to find, we can as well find the mass of the beaver.

Kinetic energy formula is expressed as;

KE = 1/2mv²

m is the mass

v is the speed

Given

KE = 45Joules

v = 2.0m/s

Substitute into the formula and get the mass

45 = 1/2m(2)²

45 = 2m

m =45/2

m = 22.5kg

Hence the mass of the beaver is 22.5kg

no. dot product   =0 when vecs at right angles

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