The instantaneous height and horizontal distance x traveled by projectile are x=5t and y=5t-2t2. what is the acceleration if distance is measured in meters and time in seconds?

[a] 10m/s2 [b] 4m/s2

[c] 6m/s2 [d] 8m/s2

Question

The instantaneous height and horizontal distance x traveled by projectile are x=5t and y=5t-2t2. what is the acceleration if distance is measured in meters and time in seconds?

        [a] 10m/s2               [b] 4m/s2

        [c] 6m/s2                 [d] 8m/s2

jamesj · Answer

Well first of all: in what direction is the projectile accelerating?

jamesj · Answer

...just by inspecting these equations of motion?

anonymous · Answer

James please check this link... http://iitphysics.org/mcq_kinematics.htm

jamesj · Answer

Why? I know the answer here, I'm trying to help you get to it.

So I'll cut to the chase. You have the displacement of the projectile as a function of t. The acceleration is the second time derivative of the displacement.  Find that second derivative and you will be able to answer the question.

anonymous · Answer

i don't know about kinematics as well... but i want answers for that questions
please help me...

anonymous · Answer

Did u check that link?

jamesj · Answer

Yes. I can't answer all of those questions for you, I don't have the time.

anonymous · Answer

First 20 Questions Pls..