Question

An object of mass 5 kg is thrown vertically upward with velocity 40 m/s. find the following (a) What is kinetic energy of the object after 2 seconds? a) 1000 J b) 100J c) 10 ) d) None of these ​

Answer 1

It's A. 1000J

m = 5 kg

u = 20 m/s (Initial velocity)

Initial kinetic energy,

K.E. = 1/2 mv2

K.E = 1/2 × (5) (20)2

K.E. = 1000 J

Answer 2

Answer:

Explanation:

2sec = 5kg/40m/s = 1/20.

K.E = 0.10.

Or 100J.