um motorista está viajando de carro em uma estrada a uma velocidade constante de 108km/h quando percebe um cavalo a sua frente e decide frear, imprimindo uma deseceleração constante de 18km/h por segundo. caucule a distância minima de frenagem em metros

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s