physics help!?

Question

A(n) 892 N man stands in the middle of a

frozen pond of radius 14.9 m. He is unable to

get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1 kg physics

textbook horizontally toward the north shore,

at a speed of 7.2 m/s.

The acceleration of gravity is 9.81 m/s

2

.

How long does it take him to reach the

south shore?

Answer in units of s.

Answer 1

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recoil speed Vr = m*V/(W/g) = m*V*g/W = 1*7.2*9.81/892 = 7.92*10^-2 m/sec 

time t = r/Vr = 14.9*10^2/7.92 = 188 sec (190 with just 2 sign. digits)

Answer 2

his mass M = 892N / 9.81m/s² = 90.9 kg

t = r / v = 14.9m / (7.2m/s * 1kg/90.9kg) = 188 seconds