An 800 kg car moving at 80 km hr\(^{-1}\) collides with a...
An 800 kg car moving at 80 km hr\(^{-1}\) collides with a 1200 kg car moving at 40 km hr\(^{-1}\) in the same direction. If the cars stick together, calculate their common velocity.
60 km hr\(^{-1}\)
8 km hr\(^{-1}\)
40 km hr\(^{-1}\)
56 km hr\(^{-1}\)
Correct answer is B
From momentum conservation
(800 x 80) - (1200 x 40)
= (800 + 1200) V
= 64000 - 48000 = 2000V
16000 = 2000V
V = \(\frac{16000}{2000}\)
= 8kmh\(^-1\)
The common velocity = 8kmhr\(^{-1}\)
The Earth's magnetic equator passes through Jos in Nigeria. At Jos. the ...
Which of the following statements about static friction is correct? It ...
The core of an efficient transformer should consist of laminated pieces of metal in order to ...