Question

a body of mass 5kg universally at rest is subjected to a force of 20 and what is the ke by the body at the end of 20 second​ Please answer

Answer 1

Answer:

16000j

Explanation:

a body is at rest

so intial velocity is zero

a force is exerted

which made it move

F=ma (where m is mass and is acceleration)

20=5a

a=4m/s²

now using Newton's first equation of motion

v=u+at

v=0+(4*20)

v=80m/s²

KE=1/2mv²

KE=1/2*5(80-0)²

KE=16000j

KE=16KJ