teron. recoil Ub/x2, where b is a constant. What is Fx, the x component f the of

Question

teron. recoil Ub/x2, where b is a constant. What is Fx, the x component f the of the force on the ion? What is Fy, the y component of the force f the on the ion? d to .P55 (a) A 0.5 kg teddy bear is nudged off a window sill and ay," ium falls 2 m to the ground. What is its kinetic energy at the instant it hits the ground? What is its speed? What assumptions or approximations did you make in this calculation? (b) A 1.0kg ing wo 20 ha flowerpot is nudged off a window sill and falls 2m to the ground. What is its kinetic energy at the instant it hits the ground? What is its speed? How do the speed and kinetic energy compare to that of the teddy bear in part (a)? P56 You throw a ball of mass 1.2 kg straight up. You observe ing to your hand

Explanation / Answer

assuming there is no air resistance,

Applying energy conservatiion,

PEi + KEi = PEf + KEf

m g h + 0 = 0 + m v^2 / 2

v= sqrt(2 g h ) { independent of mass}

and KE = m g h

(A) KE = 0.5 x 9.8 x 2 = 9.8 J  

v= sqrt(2 x9.8 x 2) = 6.26 m/s

(B) KE = 1 x 9.8 x 2 = 19.6 J  

v = 6.26 m/s

Speed is same but KE is greater (double) as mass is greater(double.)

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