Question

a truck of mass 800 kg generates a power of 20000W . how much time does the truck need to accelerate from speed of 20 m/s to30m/s?​

Answer 1

Answer:

Given:

mass(m)=800kg

initial velocity (u)=20 m/s

final velocity (v) =0 m/s

distance(s)= 8m

We have to find acceleration which is the retardation.

2as = v square - u square

2a×8 = 0 square × 20 square

16a= - 400

a=-400/16

a= -25 m/s

Retarding force:

F=ma

F= 800 × (-25)

F= -20000N