Dee asked in Science & MathematicsPhysics · 9 months ago

a high jumper jumps 1.20m straight up. what speed will he leave the ground?

A high jumper jumps 1.20m straight up. what speed will he leave the ground? 

Update:

a) how high does a ball rise if it is thrown vertically upwards at 7.00m/s?

b)how long does it take to reach its highest position?

c) how long does it take to return to your hand after leaving it?

d)what is velocity when it strikes your hand? 

1 Answer

Relevance
  • oubaas
    Lv 7
    9 months ago
    Favourite answer

    A high jumper jumps 1.20m straight up. what speed will he leave the ground?

    Vo = √2gh = √19.612*1.2 = 4.85 m/sec

    a) how high does a ball rise if it is thrown vertically upwards at 7.00m/s?

    h = Vo^2/2g = 7^2/19.612 = 2.50 m

    b)how long t does it take to reach its highest position?

    t = Vo/g = 7/9.809 = 0.71 sec

    c) how long t' does it take to return to your hand after leaving it?

    t' = 2t = 0.71*2 = 1.42 sec

    d) what is Vf velocity when it strikes your hand?

    Vf = -Vo = -7.0 m/sec

    • Commenter avatarLog in to reply to the answers
Still have questions? Get answers by asking now.