Question 23 of 32 A truck has a mass of 9000 kg and a kinetic energy of 18,000 J. What is its
speed?
A. 4 m/s
B. 8 m/s
C. 2 m/s
D. 1.4 m/s
UBMIT

2m/s

Explanation:

Given parameters:

Mass of truck  = 9000kg

Kinetic energy = 18000J

Unknown:

Speed  = ?

Solution:

Kinetic energy is the energy due to the motion of a body;

  K.E  = mv²  

 So;

 m is the mass

  v is the speed

   2 KE = mv²

  2 x 18000 = 9000 x v²

     v²  = 4

     v = 2m/s

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

d. platinum would have the greatest temperature increase because it has the lowest specific heat.