Work and Energy previous | 2 of 11/ neda Part A ± Work and Energy How much work

Question

Work and Energy previous | 2 of 11/ neda Part A ± Work and Energy How much work is done when a 195 g tomato is lifted 16.4 ? Expres s your answer with the appropriate units. An object can possess of motion, and or potentiel energy, the energy of position. Energy can be transferred in many ways, one of which is in the form of work. Work, an, is the energy transferred when an object is caused to move a distance, d, against a force, F Mathematically, we would write this as energy, the energy Hints w = 31.4 J Submit My Answer Give Up Force is the product of mass, m, and acceleration, Correct The energy transferred to the tomato by doing work on it increases its potential energy because the tomato is now at a greater height or position relative to the ground When the acceleration is due to gravity, the symbol g is used instead of a, and its value is g 9.81 Im s-2 Kinetic energy Kinetic energy E. is given by the formula mu2 where m is mass is the mass in kilograms and u is velocty in meters per second Part B of the tomato when it hits the ground? Assume 88.8 % of the work done in Part A is transferred to kinetic energy, by the time the tomato The tomato is dropped. What is the velocity, t hits the ground Express your answer with the appropriate units. Hints 8.56 J Submit My Answes GNe Up Incorrect; Try Again; 4 attempts remaining

Explanation / Answer

work done = mass* accleration due to graivity* height

mass in gm need to be converted to kg. 195 gm= 195/1000 kg= 0.195 kg

accleration due to gravity, g= 9.8 m/sec2

work done = 0.195*9.8*16.4 kg(m/sec2)* m = 31.34 Joules

88.8% of the work done =0.888*31.34 joules =27.83 joules

now kinetic energy= (1/2)*mV2= 27.83 , V = velovcity in m/s

V2= 27.83*2/m=27.83*2/16.4, V =1.84 m/sec

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