Questions and Answers - Height Obtained by a Particle

?A particle is thrown horizon at angle with tal from the ground . After 4seconas it reaches to a paint's, and after 5 more seccords it strikes the ground. Find the height of 'p' and maximum height at tained by the particle? y ans: up y 0 A X T= zusino = 9 g zusino =9 10 = using =45 2xt otop; y= usinoxt - 1/29t2 : 45x4 - 1/2 X10x42

= 180-80-100m Hmaxe 1 using If 45 2g 20 = 101.25m

?A base is thrown from a point at a distance Gom from a wall of height so ISM It just clears 2 the wall and then all - ains maximum height. find the maximum h- eight if the angle of projection is 45°? ans: Y u P 15m O 40m A x Equation of projection ; y = x tano- - gx2 242 coro 15=40 2 X tanus - 10x402 2420 cosus

= 40 - 16000 42 16000 = 40-15 4- 42 = 16000 = 640 45 Hmax = u'sin't 1 640xsin'45 2g 20 = 16m y = atano (1-) R R = us sin 20 g