42. John is moving a 14 kg box in a Phsyics lab on an approximately frictionless surface. If the box is initially at rest and zaim applies a force of 15 N for 4.7 s, what would be the speed of the box at the end of the 4.7 period? A. 30 m/s В. 12 m/s C. 2.7m/s D. 1.8 m/s E. 5.0 m/s

A box slides from rest down a curved slope. Its initial height is 31_m above the ground, and it comes off the slope 8.m above the ground. How fast is the box moving as it leaves the slope? Assume friction is negligible. 11.93_m/s В. 27.97_m/s С. 21.23_m/s 31.24 m/s 42.42 m/s F. А. D. Е. 36.12_m/s

A 10 N of force is applied to a toy car and toy car accelerates to 2m/s^2. If 20 N of the force is applied on the same toy car, the toy car now accelerates to   A. 2m/s^2   B. 3m/s^2   C. 4m/s^2   D. 6m/s^2

A 1,865.66 kg car at rest at the top of a hill 20 m high is given a nudge and begins to roll down the hill.  It rolls up a 8.39 m hill on the other side.  How fast is it moving as it tops the lower hill?

A physics student, in a stationary elevator, places a 240.0 g mass on an electronic balance. The student hits the elevator button and it begins to move upwards. While the elevator is moving, the student records this information Time = 0 to 3.0 sec the balance reads 278 grams Time = 3.0 - 12 sec the balance reads 240. grams Time = 12.0 to 15.0 sec the balance reads 192 gram How far up (in meters) did the elevator travel? Consider: UP to be (+), DOWN to be (-) and g =9.8 m/s2 .  ROUND YOUR ANSWER TO A WHOLE NUMBER of meters (no decimal places) HINT: This problem requires finding THREE different displacements and adding them up! 2nd HINT:  You will need to (A) use your equations of motion or (B) make a v-t graph to find those displacements!

A flower pot falls from a window that is 50 meters high. When is the speed of the flower pot 10 m/s? A.During the entire time of its fall B.After it has fallen 10 meters C.At the end of the first second of its fall D.At no time is the speed 10 m/s

A 12.5 kg box sits on a shelf that is 1.8 m high. If it is dropped, how fast will it be going just before it hits the ground?     m/s

i need help finding U, K, and E

Your mass is 94.2 kg, and the sled s mass is 16.1 kg. The sled is moving by itself on the ice at 5.05 m/s. You parachute vertically down onto the sled, and land gently. What is the sled s velocity with you now on it? 0.85 m/s 0.74 m/s 0.44 m/s 0.96 m/s

Leo, who has a mass of 72.0 kg, is riding his rollerblades when he collided with the wall. The wall exerted 2895 N of force and brought his body to a stop after 0.370 seconds. What is Leo's velocity before he collided with the wall? 16.9 m/s O 18.9 m/s O 19.4 m/s 14.9 m/s