Page 19 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PSPM SP015

PSPM 2011/2012 SF016/2 No. 2(c)

62.

20 m s -1

40
P

60 m

FIGURE 2.18

FIGURE 2.18 shows a ball being thrown from the top of a building towards a wall
-1
60 m away. The initial velocity of the ball is 20.0 m s at 40 to the horizontal.

(a) How much time does it take to hit the wall? [2 m]

(b) What is the distance between P and the position the ball strike the wall? [2 m]

(c) What is the speed of the ball when it strikes the wall? [3 m]

PSPM 2013/2014 SF016/2 No. 2(c)

63. (a) Why is the displacement and velocity in a projectile motion can be analysed
separately in the x and y-directions? [1 m]

-1
(b) A projetile motion is launched with a velocity of 45 m s at an angle of 60 from
the horizontal. Determine the time when the velocity makes an angle 30 with the
horizontal for the first time. [4 m]

PSPM 2015/2016 SF016/2 No. 2(c)

-1
64. A javelin is thrown with a speed of 55 m s at an angle of 42 with the horizontal.
Calculate the velocity of the javelin after 5 s. [6 m]

19