Question

Answer the following with brief explanation and readable solution if possible.

1.) 2kg object moves at 2m/s. Its kinetic energy is ___. And its momentum is ___.

2.)A railroad car with no roof is travelling along a horizonta l track in pouring rain. As the car is filled with water, its speed will ___.
A. increase
B. decrease
C. stay the same
This is in accordance with the principle of ___.
D. Inertia
E. Momentum conservation
F. Impulse and momentum.

3.)To lift the 5000-N weight, a man finds that he must pull 10m of rope through his hands for every 1m the weight rises. Neglecting the weights of the pulleys and friction, how hard must the man pull on the rope to raise the weight?
A. 5 N
B. 50 N
C. 500N
Which illustrates ___.
D. Newton’s 2nd Law
E. impulse equals a change in
momentum
F. work input equals work output.

4.)A jeepney and a truck are moving at the same speed when they crash into a cement wall. The car to have
the greatest force of impact will be___.
A. the jeepney
B. the truck
because ___.
C. they are travelling at the same
speed
D. the truck’s momentum is much
greater.

Answer 1