Firstname: Please solve all the 4 questions. Total score is 25 points. Formula S
ID: 1775555 • Letter: F
Question
Firstname: Please solve all the 4 questions. Total score is 25 points. Formula Sheet is provided separately. Show your calculations with formulae used. Points shall be deducted for work not shown. 1. An object with a mass of 9 kg moves with a velocity of 100 em/s Find the momentum of this object. (2.5 points) a. b. Find the kinetic energy of this object. (2.5 points) 2. An object has a kinetic energy of 245 J and a momentum of magnitude 22.9 kg·m/s. a. Find the speed of the object. (2.5 points) b. Find the mass of the object. (2.5 points) Find the spring constant of a spring that gets compressed 3 cm under the weight of a woman with 90 kg mass. (5 points) 3.Explanation / Answer
Question no. 1
Given that
m= 9 kg , v =100cm/s= 1m/s
So
A. Momentum p = mv=9×1=9 kgm/s
B. Kinetic energy K =1/2 mv^2 = 1/2 ×9×1^2= 4.5 J
Question 2.
Given that K =245 J , p=22.9 kgm/s
A. Since K=1/2 pv
Speed v = 2K/p=2×245/22.9=21.397m/s
B.mass m=p/v= 22.9/21.397=1.07kg
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