4. A baseball is hit at ground level. The ball is observed to reach its maximum height above ground levei 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence tha is 97.5 m from where it was hit. How high is the fence?

4. A baseball is hit at ground level. The ball is observed to reach its maximum height above ground levei 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence tha is 97.5 m from where it was hit. How high is the fence?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter4: Motion In Two And Three Dimensions

Section: Chapter Questions

Problem 51P: MIT’s robot cheetah can jump over obstacles 46 cm high and has speed of 12.0 km/h. (a) If the robot...

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

m/s
e.
14 m/s
4. A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s
after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that
is 97.5 m from where it was hit. How high is the fence?
a.
8.2 m
15.8 m
b.
13.5m
d. 11.0 m
4.9 m
C.
a 苓
hp

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