Question

A ball with a mass of 0.5 kg is thrown vertically upward with a speed of 415 m/s what are its speed and direction two seconds later?

Answer 1

`v=395\;\;m/s` in upward direction.

Step-by-step explanation:

Given,

Mass of ball
`m=0.5\;kg`

Initial speed
`u=415\;m/s`

time
`t=2\;second`

Acceleration
`a=-g=-9.8\;m/s^2`

By the Newton's 1st equation,

`v=u+at\\v=415-9.8*2\\v=395\;\;m/s`

The final velocity is positive, it means the direction of final velocity is upward.