1. What is the velocity of a go-kart with a mass
of 25 kg and 50 J of kinetic energy?

Explanation:

The formula for KE is

which makes solving our problem for velocity super easy. We will rewrite the formula in terms of v to get:

and filling in:

so

v = 2 m/s to the correct number of sig fig's

i cant see the choices man

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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