After a ball has been falling under gravity for 5 seconds it passes through a piece of glass and loses half velocity. If it now reaches the ground in 1 seconds find the height of the glass above the ground. A particle is projected vertically upward from ground level with a speed of 50 m/s. For how long will it be more than 70 m above the ground?
After a ball has been falling under gravity for 5 seconds it passes through a piece of glass and loses half velocity. If it now reaches the ground in 1 seconds find the height of the glass above the ground. A particle is projected vertically upward from ground level with a speed of 50 m/s. For how long will it be more than 70 m above the ground?