1) a force of 157 n is applied to a box 25o above the horizontal. if it is applied over a distance of 14.5 m how much work is done? 2) jamie decides to drop an egg that has a mass of 345 g off the top of a 8.2 m building. how fast will it be falling right before it hits the ground? 3) snookie is riding in her little red wagon (total mass of 215 kg) at a constant speed of 9.5 m/s. all of a sudden a magenta lemur (19.7 kg) appears in her lap. how fast is the snook-meister traveling now? 4) police are investigating an accident. they know that tom brady was driving 20 m/s before being hit by jay z head on. tom brady’s car has a mass of 1100 kg and jay z’s has a mass of 1475 kg. they also know that the two cars stuck together and were traveling 7 m/s in the same direction as jay z was driving. the speed limit was 25 m/s, was jay z speeding? 5) a ball is being swung in a horizontal circle of radius .23 m at a rate of 7.8 m/s. if the ball has a mass of 0.63 kg, find the force of tension on the string.

#1

Work done is given by

here we know that

F = 157 N

d = 14.5

now from the above formula

#2

By energy conservation

Initial total potential energy of egg = final total kinetic energy of egg

#3

By momentum conservation we know that

#4

by momentum conservation we know that

let direction of velocity of Jay Z car motion is positive direction

now we will say

Yes Jay Z is overspeeding as his speed is more than speed limit

#5

Tension force in the string will be centripetal force

so here we can say

here we know that

m = 0.63 kg

v = 7.8 m/s

R = 0.23 m

choosing tennis and golf balls is your inde choice.

their mass and volume are dep

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