Author Topic: M2 doubt!!!!!  (Read 1342 times)

Offline spiderman

  • SPIDERMAN
  • SF Immigrant
  • **
  • Posts: 64
  • Reputation: 792
M2 doubt!!!!!
« on: July 11, 2010, 06:46:19 am »
Hey guys..............cud ull pls help me wit these sums on projectiles????

1) The equation of the path of a projectile is y=0.5x-0.02x^2. Determine the initial speed of the projectile?

2) A tennis player strikes the ball at a height of 0.5m. It passes above her opponent 10m away at a height of 4m, and lands 20m from the first player, who has not moved since striking the ball. Calculate the angle of projection of the ball??
Always hangin around ur neighbourhood..........

Offline cooldude

  • SF Citizen
  • ***
  • Posts: 172
  • Reputation: 3600
Re: M2 doubt!!!!!
« Reply #1 on: July 11, 2010, 07:46:49 am »
Hey guys..............cud ull pls help me wit these sums on projectiles????

1) The equation of the path of a projectile is y=0.5x-0.02x^2. Determine the initial speed of the projectile?

2) A tennis player strikes the ball at a height of 0.5m. It passes above her opponent 10m away at a height of 4m, and lands 20m from the first player, who has not moved since striking the ball. Calculate the angle of projection of the ball??

1) let theta=a
y=xtana-(gx^2/2u^2 (cosa)^2))
tana=0.5 and 0.02=10/(2u^2 (cosa)^2))
from the first equation a=26.6
and substituting a in the second equation we get u= 17.7 m/s

2) substitute all the variables each time in pairs of three in the equation of a trajectory as follows-->
again theta=a
0.5=-(10x^2/2u^2 (cosa)^2))
0=20tana-(10(20^2)/2u^2 (cosa)^2))
4=10tana-(10(10^2)/2u^2 (cosa)^2))
solve them ull get ur ans





Offline Meticulous

  • SF Master
  • ******
  • Posts: 2486
  • Reputation: 19401
Re: M2 doubt!!!!!
« Reply #2 on: July 11, 2010, 11:39:17 pm »
Thanks cooldude! +rep!

Offline spiderman

  • SPIDERMAN
  • SF Immigrant
  • **
  • Posts: 64
  • Reputation: 792
Re: M2 doubt!!!!!
« Reply #3 on: August 29, 2010, 07:50:41 am »
Thanks a lot..............+rep for u
Always hangin around ur neighbourhood..........