A car is travelling at 70 mph and and a lorry is travelling at 50 mph calculate the speed of the car relative to the lorry. I WILL GIVE BRAINLIEST AND 100 points

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

What is the speed of an object at a given moment?

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false