ate. As it c e to the ssive r Honors Physics-Motion sho Name: tion Problem Sevin

Question

ate. As it c e to the ssive r Honors Physics-Motion sho Name: tion Problem Seving. Show all work using GUESS Constant Velocity: Ad-vt A military device is dropped from a plane. When it hits the water, it is falling at 30 m/s. In water, the device decelerates at a rate of -12.5 m/s. What is the speed after 2.2 seconds? 1) 2) A train traveling at 50 m/s accelerates at a rate of 4 m/s for 11 seconds. How far does the train travel during those 11 seconds? Givens/Unknown A zip line has a braking mechanism that allows a rider to come to a stop from a speed of 3 m/s. If the rider has a deceleration of-12 m/s', what is the distance it will require to stop? 3) 4) A sprinter who can accelerate at a rate of 5 m/s is jogging at 3 m/s. How many meters does it take for him to accelerate to a speed of 13 m/s? Givens UnknounFo

Explanation / Answer

1)usin the equation of linear motion we have

v = u + at

v = 30 - 12.5*2.2

= 2.5 m/s

2) S = ut + 0.5at^2

S = 50*11 + 0.5*4*11^2

= 792 m

3) v^2- u^2 = 2aS

0^2- 3^2 = 2*-12*S

= 0.375 m

4) v^2 - u^2 = 2aS

13^2 - 3^2 = 2*5*S

S = 16 m

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