Um carrinho de mão, que se movimenta sobre uma ponte, como mostra a figura, onde o corpo se desloca do ponto A, considerada posição inicial (S0) e o ponto B, considerado a posição final (SF) a uma aceleração constante de 15 m/s e um intervalo de tempo de 21 segundos, avaliando que a variação de espaço percorrido é calculada pela diferença entre a posição final e a inicial.

No because scientist are still changing there mines today so they are not correct to this day

The object's initial distance above the groundthe object's initial velocity

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.

Compounds is the answer