A 10-N net force is applied for 5.0 s to a 12-kg box initially at rest. What is the speed of the box at the end of the 5.0 s interval? A. 7.5 m/s B. 5.25 m/s C. 4.17 m/s. D. 8.12 m/s

29. In problem no.28, in a simple rectilinear * motion, a mass of 100 Kg is given an acceleration of 2.0 m/s². Find the kinetic energy for time t = 4.0 s. O a. 4.6 KJ Ob. 3.8 KJ O c. 3.2 KJ O d. 2.4 KJ

A ball is projected into the air with 100 J of kinetic energy. The kinetic energy is transformed into gravitational potential energy on the path towards the peak of its trajectory. When the ball returns to its original height, its kinetic energy is ____ Joules. Do consider the effects of air resistance. Hintg=10m/s/s. a. less than 100 b. 100 c. more than 100 d. not enough information given

A 4 kg rocket has a has 60 J of kinetic energy. What is the kinetic energy of the rocket if its mass increases to 12 kg and travels at the same speed?a) 20J.  b) 60J.  c) 180J. d) 540J

Two cars are moving. The first car has thrice the mass of the second car but only 1/3 as the kinetic energy. When both cars increase their speed by 9 m/s, they then have the same kinetic energy. Calculate the original speeds of the first car. a. 15.59 m/s2 c. 2.35 m/s2 b. 5.20 m/s2 d. 5.30 m/s2

A 1200 kg car is moving at 30 m/s and comes up to a hill. How high can the car go up the hill before stopping? B I

38. An object of mass 100g projected vertically upwards from the ground level has a velocity of 20m/s at a height of 10m calculate it kinetic energy at the ground level. [g=10m/s², neglect air resistance] A. 10J B. 20J C. 30J D. 50J

A skier at the top of a 12-m-high ski slope has an initial speed of 4.0 m/s. What is the speed of the skier when she arrives at the 3.0-m peak of the smaller hill? 24 12 m O a. 17 m/s O b. 20 m/s O c. 14 m/s O d. 23 m/s O e. 11 m/s m S 4.0- 3.0 m QUESTION 2 A 5.0-kg is sliding in a straight line on a level surface with an initial speed of of 6.0 m/s. If the coefficient of kinetic friction between the block and the surface is 0.50, how long will it take for the block to come to rest? O a. 1.2 s O b. 1.4 s O c. 1.8 s O d. 1.0 s O e. 1.6 s

An object is thrown vertically upward from the ground level. It reached a maximum height H. If air resistance is negligible, which of the following must be true for the object when it is at a height H/2? A. Its speed is half of its original speed. B. Its kinetic energy is half of its initial kinetic energy. C. Its potential energy is half of its initial potential energy. D. Its total mechanical energy is half of its initial value.

A spring gun with a spring constant of 250 N/m is compressed 5 cm. How fast will a 0.025 kg dart go when it leaves the gun? O a. 5 m/s O b. 20 m/s O c. 10 m./s O d. 15 m/s