# physics

posted by .

A particle is projected from ground in a vetical direction at t=0 sec. at t=0.8 s, it reaches h=14m .It will again come to the same height at ?

• physics -

h= v₀•t-g•t²/2 ,
v₀=h/t +gt/2 = 14/0.8 +9.8•0.8/2 = 21.42 m/s.
Time of the motion to the highest point
t₀=v₀/g =21.42/9.8=2.19 s.
t1=2•2.19 – 0.8=3.58 s.

## Similar Questions

1. ### physics

A particle, starting from point A in the drawing at a height h0 = 3.2 m, is projected down the curved runway. Upon leaving the runway at point B, the particle is traveling straight upward and reaches a height hf = 4.1 m above the floor …
2. ### physics

A particle, starting from point A in the drawing at a height h0 = 3.2 m, is projected down the curved runway. Upon leaving the runway at point B, the particle is traveling straight upward and reaches a height hf = 4.1 m above the floor …
3. ### Physics

A particle is projected vertically upwards from ground level with an initial velocity of 34.94m/s. Neglecting air resistance, calculate the total time taken, in seconds, for the particle to hit the ground again. Take the magnitude …
4. ### physics

A particle is projected vertically upwards with velocity of u.after t seconds particle is projected from some point with same velocity.How long does it take for the second particle to meet the first particle?
5. ### math

A particle A is projected vertically upwards from a point O on horizontal ground with speed 20ms. At the same instant a particle B is released from rest at point P which is 30 m above the ground. The point P Is not directly above O …
6. ### science

A ball is thrown upwards and reaches the ground once again after 4 sec: (a)calculate the height that the ball reaches (b)the total distance covered by the ball (c)the velocity with which the ball hits the ground
7. ### Physics

A particle is projected vertically upward from ground with velocity 10 m/s. Find which time particle reaches highest point?
8. ### science

a particle is projected vertically upward from ground with velocity 10 m/s. Find which time particle reaches highest point?
9. ### physics

A stone thrown upward at the top of the tower reaches the ground after 5 sec. A second stone is thrown down with the same speed and reaches ground in 3 sec. What is the height of the tower
10. ### work and energy PHYSICS

A particle is projected vertically upwards from a point O on horizontal ground which reaches the maximum height Q. What is the energy associated at O and Q?

More Similar Questions