Question

A girl skateboards with a kinetic energy of 2543.2 j. If the girl and skateboard have a total mass of 110kg, what is her speed?

Answer 1

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Answer 2

Her speed is 6.8m/s.

Step-by-step explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s