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a 2,460 kg truck traveling north with a speed of 130 km/hr runs into a car traveling in the same direction with a speed of 89 km/hr.
the mass of the car is 1,225 kg.
after the collision, the two move northward together as one mass.
what is the speed of the wreck?

a) 13.4 km/hr

b) 120 km/hr

c) 22.7 km/hr

This is the answer of your question

Initial velocity,  u = 4.9 m/sfinal velocity = v m/sinitial height,  h₁ =  245 m    final height, h₂ = 0a = -9.8  m/s²time taken = t secondss = ut + 0.5at²⇒  (h₂-h₁) = ut + 0.5at²⇒  0-245 = 4.9t + 0.5×(-9.8)×t²⇒ -245 = 4.9t - 4.9t²⇒ 4.9t² -4.9t -245 =0solving it, we get   t = 7.59sv  = u +  at = 4.9 -9.8×7.59 = 4.9 - 74.38 = -69.48 m/svelocity is  69.48 m/s downward