A particle is projected with a velocity 40 m/s at an angle with the horizontal. Find the change in velocity when it is at a height of 15 m from the ground, (g = 10 )
Horizontal velocity remains constant
Vertical velocity changes
Initial vertical velocity
= 20 m/s
At height 15 m its vertical velocity
= 400 – 300
Change in velocity = 20 – 10 = 10 m/s.