Question

a body of mass 5 kg is thrown downward with a velocity 20m/s . the kinetic energy at t= 2 sec is​

Answer 1

Answer:

3920.4

Explanation:

using v = u + gt

for g=9.8 m/s^2

v= 20 + 9.8 *2 = 39.6 m/s

so KE = 1/2 * 5* 39.6^2 = 3920.4

and if g is taken 10m/s^2

KE = 4000