Um corpo de massa m desliza sobre um plano horizontal com
velocidade constante. Sabendo que existe uma força de atrito
cujo coeficiente de atrito é = 0,5 entre o corpo e o plano e
após ter percorrido uma distância de 20m, o trabalho da força
de atrito foi de W= –2000J. Considerando que g = 10m/s2
,
podemos afirmar que a massa m em quilogramas do corpo é de
a) 50
b) 200
c) 20
d) 25
e) 40

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)

If the new moon happens on january 15th, what shape will it be on february 6th?