ExamKrackers 1001 Physics Question

[Hirwipi]

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Hi Everyone,

I was wondering if someone could help me figure out how to solve a problem on projectile motion (don't know why this topic throws me off so much!).

It's from EK 1001 Physics, #111:

How far can an animal jump if it can run at 20 m/s and leap from the ground with a vertical velocity of 5 m/s?

a. 5 m
b. 10 m
c. 20 m -- correct answer
d. 40 m

Thanks for any help 🙂

 

[Temperature101]

Hi Everyone,

I was wondering if someone could help me figure out how to solve a problem on projectile motion (don't know why this topic throws me off so much!).

It's from EK 1001 Physics, #111:

How far can an animal jump if it can run at 20 m/s and leap from the ground with a vertical velocity of 5 m/s?

a. 5 m
b. 10 m
c. 20 m -- correct answer
d. 40 m

Thanks for any help 🙂

V = VoT + aT... T = 0.5s.... It will take 1 second to complete the whole jumping time since half of it is 0.5 s..... X = Vx*T = 20x1 = 20m

 

[Shjanzey]

Hi Everyone,

I was wondering if someone could help me figure out how to solve a problem on projectile motion (don't know why this topic throws me off so much!).

It's from EK 1001 Physics, #111:

How far can an animal jump if it can run at 20 m/s and leap from the ground with a vertical velocity of 5 m/s?

a. 5 m
b. 10 m
c. 20 m -- correct answer
d. 40 m

Thanks for any help 🙂

You can solve this intuitively in your head. You need to know how long he is in the air so if he jumps up at 5m/s then it take 5/10 = 0.5 seconds to reach his apex.

It takes a total of 0.5 * 2 for him to go up and then come down 😀 Now you know he is in the air for 1.0 s.

Since he is travelling horizontally at 20 m/s you can easily say he went 20 meters in 1 second 😀

 

[Hirwipi]

You guys are awesome, thanks!! 😀