Question #d8d98
2 Answers
a):
b):
c):
Explanation:
I'm going to assume it was thrown straight upward, since there's only one velocity equation given.
a)
To find the maximum height reached by the tennis ball, we need to find the time
0 = 5-10t
10t = 5
t = 0.5 "s"
To find its position
Plugging in the time
b)
Now, we're asked to find and describe the object's velocity at the time
We found in part a) that its velocity is
To find the velocity, we simply plug
The negative sign indicates that the object is traveling downward at this time. Its velocity is thus
c)
For any object that is launched (near Earth's surface), it's acceleration is always
(a)
(b)
(c)
Explanation:
Let us assume that the tennis ball is thrown upwards (
Kinematic equation for the velocity is given as
v= 5-10t .....(1)
Compare it with the general kinematic expression
v= u+at .....(2)
whereu is the initial velocity,v is velocity after timet anda is acceleration.
At
(c) Also we get
(a) Greatest height is reached when
v^2-u^2=2ah ......(3)
we get
Recall that the tree house is located
(b) Velocity at
v_1.2= 5-10xx1.2
=>v_1.2= -7ms^-1
-ve sign shows that the tennis ball is moving with this velocity towards ground.
Lets verify height at
The ball is