Twelve seconds after starting from rest, an object falling freely will have a sp

Question

Twelve seconds after starting from rest, an object falling freely will have a speed of 100 m/s. 50 m/s. 120 m/s. 10 m/s. You are driving a car with a speed of 90 km/hr, suddenly you see a dog 50 meters away. When applying the brakes a maximum acceleration of -7.5 m/s2 is obtained. The distance traveled before stopping will be: 24 m 80 m 50 m 42 m The two measurements necessary for calculating average speed are (velocity and time). (distance and time). (acceleration and time). (velocity and distance). (distance and acceleration). How fast should a salmon jump out of the water and reach the maximum height of a 2.1 m high waterfall? 3.6 m/s 8.3m/s 0 m/s 6.4 m/s

Explanation / Answer

7) using first equation of motion...

v = u + at

= 0 + 10×12

= 120 m/s

Option c

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