(10%) Problem 2: A rock of mass m 1.15 kg is dropped from a height of h-2.6 m in

Question

(10%) Problem 2: A rock of mass m 1.15 kg is dropped from a height of h-2.6 m into a pool of water. At a time of t-1.4 s after striking the surface of the water, the rock's velocity has decreased by 50% Otheexpertta.com ? What is the magnitude of the average force the rock experiences, in newtons, during the time t? Grade Su Deductions Potential mma 0% 100% ave cos0 tanO ( acosO Submissions Attempts remaining: 20 (090 per attempt) Sin cotanasin0 atan acotan sinhO cosh0 anh cotanhO Degrees Radians detailed view END Submit Hint Hints: 400 deducti on per hint. Hints remaining: 1 Feedback: 5% deduction per feedback.

Explanation / Answer

Here ,

h = 2.6 m

speed when the object sticked the water surface ,

v = sqrt(2gh)

v= sqrt(2 * 9.8 * 2.6)

v = 7.14 m/s

let the average force is F

average force * time taken = change in momentum

1.15 * (7.14 - 7.14 * 0.50) = F * 1.4

solving for F

F = 2.93 N

the average force experienced is 2.93 N

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