H.W Projectile1. A body is projected downward at an angle 30° with thehorizontal from the top of a building 170m high. It isinitial speed is 40 m/s. How long will it take beforestriking the ground?2. A stone is projected from the ground with velocity 50m/s atan angle of 30o. It crosses the wall after 3sec. How farbeyond the wall the stone will strike the ground.3. The time of flight of a projectile is 10 seconds. If itsvelocity at the maximum height is 20 m's. What is thehorizontal range?

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1. A body is projected downward at an angle 30° with the horizontal from the top of a building 170m high. It is initial speed is 40 m/s. How long will it take before striking the ground?

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 98AP: Two speedboats are traveling at the same speed relative to the water in opposite directions in a...

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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

H.W Projectile
1. A body is projected downward at an angle 30° with the
horizontal from the top of a building 170m high. It is
initial speed is 40 m/s. How long will it take before
striking the ground?
2. A stone is projected from the ground with velocity 50m/s at
an angle of 30o. It crosses the wall after 3sec. How far
beyond the wall the stone will strike the ground.
3. The time of flight of a projectile is 10 seconds. If its
velocity at the maximum height is 20 m's. What is the
horizontal range?

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