Problem 106 Part A With what minimum speed must you toss a 1

Problem 10.6

Part A

With what minimum speed must you toss a 110 g ball straight up to just touch the 11-m-high roof of the gymnasium if you release the ball 1.3 m above the ground? Solve this problem using energy.

Express your answer to two significant figures and include the appropriate units.

With what speed does the ball hit the ground?

Part B

Express your answer to two significant figures and include the appropriate units.

Problem 10.6 Part A With what minimum speed must you toss a 110 g ball straight up to just touch the 11-m-high roof of the gymnasium if you release the ball 1.3 m above the ground? Solve this problem using energy Express your answer to two significant figures and include the appropriate units. Umin= 1 Value Units Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining Part B With what speed does the ball hit the ground? Express your answer to two significant figures and include the appropriate units | u= 1 Value Units Submit My Answers Give Up Provide Feedhack ontinue

Solution

from the law of conservation of energy, we have

         m*g*h1 + 0.5*m*v1^2 = m*g*h2 + 0.5*m*v2^2

        g*h1 + 0.5*v1^2 = g*h2 + 0.5*v2^2

    (9.81*11) + 0.5*0^2 = (9.81*1.3)+(0.5*v2^2)

                             v2 = 9.75 m/s

B) from the law of conservation of energy, we have

        (m*g*h+0) = (0+0.5*m*v^2)

             9.81*11 = 0.5*v^2

               v = 14.69 m/s