Two objects were lifted by a machine. One object had a mass of 2000 grams, and was lifted at a speed of 2 m/sec. The other had a mass of 4000 grams and was lifted at a rate of 3 m/sec.
a. Which object had more kinetic energy while it was being lifted?

The second object (4000 grams) had more kinetic energy

Step-by-step explanation:

Use the equation KE = 0.5mv², where m is the mass and v is the velocity.

Find the kinetic energy of the first object:

KE = 0.5(2000)(2 m/s)²

KE = 4000 J

Find the kinetic energy of the second object:

KE = 0.5(4000)(3 m/s)²

KE = 18000 J

So, the second object (4000 grams) had more kinetic energy.

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step-by-step explanation:

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.