When a 0.292 kg mass on a string is swung at 8.45 m/s, it feels a centripetal acceleration of 78.9 m/s^2. What is the radius of the swing? (Unit = m)

r=0.26m

Explanation:

F=mv^2/r

78.9=0.292*(8.45)^2/r

r=0.292*(8.45)^2/78.9

r=0.26m

it may be wrong but i think its a

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length