Question

DQuestion 34 1 pts A5 kg projectile is fired at an angle of 25° above the horizontal. Its initial velocity is 200 m/s and just before it hits the ground its velocity is 150 m/s. What is the change in the mechanical energy of the projectile? O +19,000J O-19,000 J +44,000J O -44,000J 0 Question 35 1 pts Two blocks are released from the toop of a tower One falls straight down while the other slides down a frictionless ramp. Which one is moving faster when it reaches the bottom? O The block that went straight down O The block that went down the ramp O They both will have the same speed O Insufficient information to work the problem

Answer 1

34)

Change in mechanical energy of projectile is

AKE = = m(0 – 12) = 5*5* (1502 – 2002) = -43750 ~ - 44000 J

Answer is

-44000 J

35)

For the two blocks initial energy is
E; = mgh
and final energy is
Es = 5mv-

Conserving energy of each block at the top and bottom ,

E; = Ep = mgh = -mv2 = v= 2gh

Answer They both will have the same speed.