1. To lift a bag of groceries up the stairs in 1/3 of the time (i.e. 3x faster) you need ________ much power?

Group of answer choices

A. 2x

B. 3x

C. 1/3

D. 1/2

2. What would be the final potential energy of the ball in the the checkpoint above if the ball has a mass of 2 Kg?

HINT: The gravitational potential energy is defined as

PE = m g h,

where m is mass, g is the gravitational acceleration (10 m/s^2) and h is height.

A. 40 Joules

B. 30 Joules

C. 60 Joules

D. 20 Joules

3. If we let the ball in the last two checkpoints roll/fall down from is final height of 3 m, what would be its Kinetic Energy when it hits the ground?

HINT: Use conservation of energy and assume it has the same mass

A. 60 Joules

B. 30 Joules

C. 40 Joules

D. 20 Joules

4.

Ignoring friction, which path requires the most work? (hint: remember that work is transfer of energy, and potential energy only depends on hight) 5 m 3 m (a) (6) (c) O a ) O c ) All require the same amount of work O b)What is the velocity of the blue truck after the collision? Give your answer in units of [m/s] (not need to type the units in the answer, they are specified here) BEFORE AFTER m - 5000 kg m = 5000 kg v= 10m/s V=??? m=1000 kg m=1000 kg v=0m/s w= 15m/sWhat is the velocity of grandma and grandson after the collision? Give your answer in units of [m/s] (not need to type the units in the answer, they are specified here) BEFORE AFTER m=60 kg m=60 kg V=? v=5 m/s m=40 kg V=? m= 40 kg v=0 m/s