A 1000 kgkg car pushes a 2000 kgkg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 NN.

A car of mass 1000kg pushes 2000kg

The forward force is 4500N

Then, summation of the forward forces is ma

ΣF = Σ (ma) = m1a1 + m2a2

Since the body are moving together then, they will have the same acceleration (a)

ΣF = Σ (ma) = (m1+m2) a

Let m1=1000kg.

m2=2000kg

F=4500N

Then,

4500 = (1000+2000) a

4500=3000a

Then,

a=4500/3000

a=1.5m/s²