Projectile Motion Question HELP!! (1 Viewer)

[Khan.Paki]

Hey guys,

I have a projectile motion question if somebody can please help me with. I normally like projectile motion questions, but this one is rattling my brain.

Any help will be greatly appreciated.

SITE FOR QUESTION: http://www.boredofstudies.org/courses/science/physics/1176894801_2005_Physics_Trial_Paper.pdf (Q1) Its the first one.

 

[Kaido]

which part specifically?

 

[Kaido]

i reckon each ball represents 1s

 

[Crisium]

i reckon each ball represents 1s

It's sort of given in the question but you can work it out using the formula:

T = 1 / f

Where f = Frequency, which in this case is equal to one

Therefore

T = 1 / 1

= 1

Time of Flight:

It flashed 11 times, therefore the time of flight is 10 seconds.

I'll leave the rest to fizzycyst because I fear that if I make a mistake he'll criticise my answer (I probably have made a mistake already)

 

[Khan.Paki]

Isn't the time of flight 10 seconds because the first flash occured when the ball was at 0 therefore its time of 'flight' should be 11-1 = 10?

 

[Kaido]

yup^

 

[Fizzy_Cyst]

(i) 10 seconds (as explained above)

(ii) the range ~85m, therefore 85 =uxt, therefore Ux =8.5m/s

(iii) After 5s, Vy = 0, use this to solve for Uy. (Should be 49m/s), then use this to find delta_Y (122.5m)

(iv) Just use the components to solve for this (~80 deg above horizontal)

Good to see that you corrected your mistake, Crisium!

 

[Khan.Paki]

Thanks so muuuuuch guys!! Finally got it. Don't know why it was so time consuming for me