Alessandra jumps on a trampoline. It takes her 1 second to
1 answer:
Answer:
The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
Explanation:
Given that,
Time = 1 sec
Height = 2 feet
We need to calculate the speed of Alessandra's motion
Using formula of speed
Where, v = speed
d = height
t = time
Put the value into the formula
The direction will be up ward.
Hence, The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
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Answer:
40 N
Explanation:
We are given that
Speed of system is constant
Therefore, acceleration=a=0
Tension applied on block B=T=50 N
Friction force=f=10 N
We have to find the friction force acting on block A.
Let T' be the tension in string connecting block A and block B and friction force on block A be f'.
For Block B
Where =Mass of block B
Substitute the values
For block A
Where Mass of block A
Substitute the values
Hence, the friction force acting on block A=40 N