Abig truck moving along a straight line at a speed of 54 km/hr stop in 5 seconds after the breaks are applied a) find the acceleration, assuming it to be constant.

a = Δv ÷ t

t = 5 seconds

Δv = v2 - v1 

v2 = 0 m/s

v1 = 54 ÷ 3.6 =  15 m/s   > a = (0 - 15) ÷ 5 = -15 ÷ 5 = -3 m/s²

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table