# physics

posted by .

A projectile of mass 0.840 kg is shot straight up with an initial speed of 22.9 m/s. (a) How high would it go if there were no air resistance? (b) If the projectile rises to a maximum height of only 8.71 m, determine the magnitude of the average force due to air resistance.

• physics -

a. KE lost=GPE gained
1/2 m v^2=mgh solve for h

b. forceresistance=mass*accelrationfriction

so
1/2 m Vi^2=mgh-frictionwork
1/2 m Vi^2=mgh-force*h

solve for force knowing Vi, and the new h.

## Similar Questions

1. ### physics

A projectile of mass 1.450 kg is shot straight up with an initial speed of 20.0 m/s. (a) How high would it go if there were no air friction?
2. ### Science

A projectile of mass 0.650 kg is shot straight up with an initial speed of 20.0 m/s. If the projectile rises to a maximum height of only 12.4 m, determine the magnitude of the average force due to air resistance.
3. ### physics

A projectile of mass 0.874 kg is shot straight up with an initial speed of 29.0 m/s. (a) How high would it go if there were no air resistance?
4. ### physics

A projectile of mass 0.550 kg is shot straight up with an initial speed of 22.0 m/s. (a) How high would it go if there were no air friction?
5. ### Physics

A projectile of mass 0.800 kg is shot straight up with an initial speed of 28.0 m/s. (a) How high would it go if there were no air friction?
6. ### Physics

A projectile of mass 1.350 kg is shot straight up with an initial speed of 22.0 m/s. (a) How high would it go if there were no air friction?
7. ### Physics

A projectile mass of 0.500 kg is shot straight up with an initial speed of 28.0 m/s. A. How high would it go if there were no air friction?
8. ### physics

A projectile of mass 0.817 kg is shot straight up with an initial speed of 25.5 m/s. (a) How high would it go if there were no air resistance?
9. ### physics

A projectile of mass 0.803 kg is shot straight up with an initial speed of 24.8 m/s. (a) How high would it go if there were no air resistance?
10. ### physics

A projectile of mass 1.000 kg is shot straight up with an initial speed of 23.0 m/s. (a) How high would it go if there were no air resistance?

More Similar Questions